Md. Code Regs. 11.14.09.09

Current through Register Vol. 51, No. 8, April 19, 2024

Section 11.14.09.09 - Lighting

A. Definitions.

(1) "Asymmetrical beam (nonsymmetrical)" means a beam in which both sides are not symmetrical with respect to the median vertical plane of the beam. All lower beams are asymmetrical.

(2) "Auxiliary driving lamp, auxiliary upper beam lamp, or auxiliary high beam lamp" means a lighting device mounted to provide illumination forward of the vehicle and intended to supplement the upper beam of a standard headlamp system. It is not intended for use alone or with the lower beam of a standard headlamp system.

(3) "Backup lamp" means a lamp used to provide illumination behind the vehicle, and to provide an indicator when the vehicle is in reverse gear.

(4) "Charge indicator" means a light, gauge, or other source indicating battery charge remaining.

(5) "Cornering lamp" means a steadily burning lamp used when the turn signal system is operating to supplement the headlamps by providing additional road illumination in the direction of the turn.

(6) "Emergency warning lamp" means a lamp that provides a flashing light to identify an authorized vehicle on an emergency mission. The emergency signal may be an oscillating lamp, a rotating beacon, or pairs of alternately or simultaneously flashing lamps.

(7) "Fog lamp" means a lamp that may be used with the lower beam headlights to provide illumination under condition of rain, snow, dust, or fog.

(8) "Hazard warning lamp" means a turn signal lamp that flashes simultaneously to warn of the presence of a vehicular hazard.

(9) Headlamps.

(a) 5 3/4 Inch Round Sealed Beam Unit.

(i) "Type 1 sealed beam" means a sealed beam unit 5 3/4 inches in diameter having a single filament and providing only an upper beam distribution of light. This unit is identified by the number 1 on the lens and is aimed on the upper beam.

(ii) "Type 2 sealed beam unit" means a sealed beam unit 5 3/4 inches in diameter having two filaments, one filament providing the lower beam and one filament providing fill-in light for the upper beam. This unit is identified by the number 2 on the lens and is aimed on the lower beam.

(b) "7 inch round sealed beam unit" means a sealed beam unit 7 inches in diameter providing an upper and lower beam. This unit is identified by the number 2 on the lens and is aimed on the lower beam. If there is no identifying number on the lens, it means the sealed beam unit is 7 inches in diameter providing upper and lower beams.

(c) "8 inch by 5 inch rectangular sealed beam unit" means a sealed beam unit providing an upper and lower beam. This unit is identified by the number 2B on the lens and is aimed on the lower beam.

(d) 6 1/2 by 4 1/4 Inch Rectangular Sealed Beam Unit.

(i) "Type 1A" means a sealed beam unit having a single filament and providing only an upper beam distribution of light. The unit is identified by the number 1A on the lens and is aimed on the upper beam.

(ii) "Type 2A" means a sealed beam unit having two filaments, one of which provides fill-in light for the upper beam. This unit is identified by the number 2A on the lens and is aimed on the lower beam.

(e) 5.93 X 3.64 inch Rectangular Sealed Beam Units.

(i) "Type LF" means a sealed beam unit having a single beam filament and providing only a lower beam distribution of light. The unit is identified by the designation LF on the lens.

(ii) "Type UF" means a sealed beam unit having a single beam filament and providing only an upper beam distribution of light. The unit is identified by the designation UF on the lens.

(f) "Replaceable bulb headlamp" means a headlamp unit comprised of one or two replaceable standard light sources such as a bulb and a headlamp housing or a lens/reflector unit.

(10) "Headlamp lower beam" means a distribution of light as directed to avoid glare in the eyes of oncoming drivers while providing illumination ahead of the vehicle, and intended for use in congested areas and on highways when meeting other vehicles within a distance of 500 feet.

(11) "Headlamp upper beam" means a distribution of light intended primarily for distant illumination and for use on the open highway when not meeting other vehicles.

(12) "Indicator lamp" means a lamp visible to the operator of a vehicle that indicates:

(a) Appropriate electrical circuits are in operation;

(b) Malfunction of vehicle performance; and

(c) Requirement for remedial action by the operator of the vehicle.

(13) "Lamp" means a device used to produce artificial light.

(14) "Lane changer" means a device, usually incorporated in the turn signal switch, which will actuate the turn signal lamps when held by the driver. It is intended for momentary use for signaling a lane change. When released by the operator, it will return to neutral and deactivate the signal lamp.

(15) "License-plate lamp" means a lamp used to illuminate the license plate on the rear of a vehicle.

(16) "Operating units or switches" means devices by which the functioning of lamps is controlled.

(17) "Parking lamp" means lamps used to designate the front of a parked vehicle.

(18) "Reflective device" means a device used on vehicles to give an indication to an approaching driver by reflected light from the headlamps of approaching vehicles.

(19) "SAE Lighting Identification Code" means a series of standardized markings for lighting devices that a manufacturer or a supplier may use to mark a product to indicate the SAE lighting standard or standards to which the device is designed to conform. The code is not intended to limit the manufacturer or supplier in applying other markings to the devices.

(20) "Sealed beam headlamp assembly" means a major lighting device used to provide general illumination ahead of the vehicle. It consists of the following:

(a) One or more sealed beam units (bulb assembly);

(b) Means for mounting securely to the vehicle; and

(c) Means to permit required aim adjustment.

(21) "Sealed beam unit" means an integral and hermetically sealed optical assembly with the name "Sealed Beam" molded in the lens.

(22) "Side marker lamp" means a lamp on the left and right sides, beamed to the side and intended to indicate vehicle length. They are located near the front and rear on each side and, for vehicles 30 feet or more in overall length, are also located at the midpoint (intermediate side marker).

(23) "Stop lamp" means a lamp giving a steady warning light to the rear of the vehicle, to indicate the intention of the operator of the vehicle to reduce speed or stop.

(24) "Symmetrical beam" means one in which both sides are symmetrical with respect to the median vertical plane of the beam. Lamps having symmetrical beams are:

(a) 5 3/4 inch diameter type 1, 1C, or 1C1;

(b) 5 3/4 inch diameter type 2, 2C, or 2C1 (upper beam filament);

(c) 6 1/2 by 4 1/4 inch type 1A or 1A1;

(d) 6 1/2 by 4 1/4 inch type 2A, 2A1, 2G1, 2E1, or 2H1 (upper beam filament);

(e) 8 by 5 inch type 2B or 2B1 (upper beam filament);

(f) All 7 inch diameter units (upper beam filament); and

(g) Replaceable bulb headlamp (upper beam filament).

(25) "Tail lamp" means a lamp used to designate the rear of a vehicle.

(26) "Turn signal lamp" means a lamp that provides a flashing warning light to indicate the intended direction of the turn.

Agency Note: The following are some examples of replaceable bulb headlamps, Type-HB1-9004 (low and high beam); HB2-9003 (low and high beam); HB3-9005 (high beam); HB4-9006 (low beam); and HB5-9007 (low and high beam). For more information and a complete list of replaceable bulb headlamps, consult an automotive lighting reference or specification guide, or vehicle manufacturer.

B. General Lamp and Reflector Inspection. This includes all original or required equipment, exterior lighting plus whatever lights are authorized.

Agency Note: Due to the limited federal standards for governing lighting requirements on low speed vehicles, lighting installed by manufacturers of low speed vehicles may conflict with the standardized lighting listed in SAE Lighting Identification Code J759 and lighting requirements under Federal Motor Vehicle Safety Standard 49 CFR § 571.108 for vehicles other than low speed vehicles. Lighting devices installed or supplied by the vehicle manufacturer will be considered in compliance under this chapter, provided the lighting device meets the color, mounting location (excluding height requirements), candle power for headlamps when applicable, and functions as designed by the vehicle manufacturer and as required under these regulations. Any additional lighting device required to be installed to meet these regulations, or is otherwise permitted, shall be in compliance with standardized lighting listed in SAE Lighting Identification Code J759 and requirements established under 49 CFR § 571.108 pertaining to passenger cars or other appropriate applications, and comply with lighting requirements established under this chapter. Any questions regarding lighting shall be referred to the Automotive Safety Enforcement Division of the Department of State Police.

Procedures:	Reject Vehicle If:
(1) Visual Check of Lamp Function. Inspect the operation of the following as designed by the vehicle manufacturer: (a) Turn signals-Actuate turn signal lever to right and left, and observe function of turn signal lights. Turn signals shall be mounted: At or near the front-One amber on each side of the vertical centerline, at the same height, and as far apart as practicable. On the rear-One red or amber on each side of the vertical centerline, at the same height, and as far apart as practicable. Turn signals shall be mounted not less than 15 inches nor more than 83 inches from the ground. (b) Backup lamps, if so equipped. Place vehicle in all forward gears and check backup lamps. Backup lamps, if so equipped, are required to function automatically when vehicle is in reverse, but may not function when vehicle is in any forward gear. Vehicle may be equipped with one or more backup lamps on the rear, either separately or in combination with other lamps. Backup lamps shall emit a white light. (c) Actuate the following and observe lamps as follows: (i) Hazard warning lamps, if so equipped. (ii) Indicator lamps for: turn signals; high beam indicator, if so equipped with high beam headlamps; hazard warning flashers, if so equipped with hazard warning lamps; brake system warning lamps, if so equipped; and charge indicator lamp or gauge, if so equipped. (iii) Stop lamps-At least two stop lamps shall be mounted on the rear of the vehicle, one on each side of the vertical centerline, at the same height, and as far apart as practicable. The stop lamps shall be actuated on application of the service (foot) brake and shall display a red light. Stop lamps shall be mounted not less than 15 inches nor more than 72 inches from the ground. (iv) Headlamps-Low beam, and upper beam if so equipped. On the front, each headlamp providing the lower beam, at the same height, one on each side of the vertical centerline, each headlamp providing the upper beam, at the same height, one on each side of the vertical centerline. Corresponding headlamps shall be mounted as far apart as practicable. Headlamps shall emit a white light. Headlamps shall be mounted not less than 24 inches nor more than 54 inches from the ground.	(1) (a) Any of the following required lamps fails to light: Headlamp, tail lamp, stop lamp, turn signal, and license plate lamp. (b) Any of the following lamps, when so equipped, fails to light: Side marker lamp, parking lamp, backup lamp, or hazard warning lamp. (c) Any of the following indicator lamps fails to function: Turn signal, high beam indicator when equipped with high beam headlamps, hazard warning flasher when equipped with hazard warning lamps, brake system warning lamp when equipped, and charge indicator lamp, gauge, or other source when equipped. (d) Turn signals do not properly indicate right or left when so switched, or do not stay in position or self-cancel, if so designed. (e) Backup light system, if so equipped, functions when the vehicle is in any forward gear, or backup light system fails to function automatically when vehicle is in reverse. (f) Any lamp shows color contrary to law, red or blue to the front, white light to the rear, except license plate lamp and backup lamp when vehicle is in reverse gear. Tail lamps shall be red, stop lamps red, turn signals amber to the front and red or amber to the rear, and headlamps white. (g) Any lamp fails to light the proper filament when switched on, or the color of the bulb has been altered. (h) Any required or permitted lamp, lens, or reflector is obscured by any object or shielded by a nontransparent material, or any headlamp is equipped with aftermarket clear, tinted, or screen-type covers. (i) Any lamp, lens, or reflector is loose or improperly mounted. (j) Any lamp, lens, or reflector, including headlamp, whether separate or combined components, has a cracked, broken, or missing lens, or is otherwise damaged or in a condition preventing it from directing or reflecting light as designed and required. (k) Except as otherwise permitted, any lamp, lens, or reflector is not an approved type. (l) Equipped with any unauthorized emergency lamp, warning lamp, or neon lighting device. (m) Headlamp output is less then 5,000 candlepower on high beam, if so equipped, or less then 3,500 candlepower on low beam. (n) Dash lamps, if so equipped, do not illuminate speedometer and odometer as designed.
(2) With night driving lights turned on, observe function of: (a) Tail lamps-At least two tail lamps shall be mounted on the rear, one on each side of the vertical centerline, at the same height, and as far apart as practicable. Tail lamps shall emit a red light. Tail lamps shall be mounted not less than 15 inches nor more than 72 inches above the ground. (b) Parking lamps, if so equipped. Parking lamps shall display two white or amber lights mounted on the front, one on each side of the vertical centerline, at the same height, and as far apart as practicable. Parking lamps shall be mounted not less than 15 inches nor more than 72 inches from the ground. (c) Side marker lamps, if so equipped. On each side-Shall display one red light as far to the rear as practicable, and one amber light as far to the front as practicable. Side marker lamps shall be mounted not less than 15 inches from the ground. (d) Reflex reflectors-Reflex reflectors shall be mounted on the vehicle in the following manner: (i) On the rear-One red on each side of the vertical centerline, at the same height, and as far apart as practicable. (ii) On each side-One red as far to the rear as practicable, and one amber as far to the front as practicable. (iii) Reflex reflectors shall be mounted not less than 15 inches nor more than 60 inches from the ground. (e) License plate lamp. Either a tail lamp or a separate lamp shall be constructed and placed to illuminate, with a white light, the rear registration plate. Any tail lamp or tail lamps, together with any separate lamp or lamps for illuminating the rear registration plate, shall be wired to be lighted whenever the headlamps or auxiliary driving lamps are lighted. (f) Dash Lamps, if so Equipped. (g) Red, white, or blue lights are used on law enforcement vehicles. Red lights, white lights, or both are used on emergency, fire department, and emergency rescue vehicles. Amber lights are used on service and maintenance vehicles.
Agency Note: Measuring mounted height of lamps. Whenever a requirement is declared as to the mounted height of lamps or devices, it means from the center of the lamp or device to the level ground on which the vehicle stands when the vehicle is without a load.

(3) Aim Inspection.

Procedures:

Reject Vehicle If:

(a) Inflate tires to recommended pressures. (b) Be sure that lenses are clean. Check for burned out bulbs and proper beam switching. (c) Check for improper tracking of the rear axle. (d) Headlamps shall be mounted not less than 24 inches or more than 54 inches above the level surface on which the vehicle stands, measured to the center of the lamp. (e) Visually check headlamp adjusters for presence and capability of holding an adjustment. (f) Check for presence of after-market headlamp covers.

(a) Headlamps are equipped with any aftermarket clear, tinted or screen-type cover. (b) Headlamps have no aiming capability. (c) Headlamps are mounted lower than 24 inches or higher than 54 inches.

C. Headlamps. Only low beam headlamps are currently required on low speed vehicles. If a low speed vehicle is equipped with high and low beam headlamps, both lamps are required to function. A low beam headlamp shall have a minimum of 3,500 candlepower and a high beam headlamp a minimum of 5,000 candlepower. Headlamps that incorporate both high and low beam in the same assembly will be aligned on low beam. Headlamp inspection and aiming by computer image processing method requires a level area sufficient for the vehicle and test equipment. The test equipment shall be accurately calibrated to the floor and accurately aligned to the vehicle.

Agency Note: Manufacturers of low speed vehicles may equip their vehicles with lamps which are not identified as approved headlamps by federal motor vehicle safety standards established for vehicles other than low speed vehicles, for example: required marking symbol of "DOT" (Department of Transportation) on headlamp lens, and any additional manufacturer's markings of headlamp type and SAE identification code. Manufacturers of low speed vehicles utilizing lighting in their vehicles as headlamps, which are not properly identified with the appropriate marking, however, are equipped with multibeam road lighting (high and low beam headlamps), will be treated as headlamps and aligned by using the Division's approved headlight testers. Lighting utilized by manufacturers of low speed vehicles as headlamps which are identified as a type lighting other than a headlamp, for example: SAE "Y", auxiliary driving lamp, or by lighting utilized as headlamps which fails to contain the appropriate headlamp marking and is not multibeam road lighting as noted above, will not be inspected and aligned by the use of the Division's approved headlight testers. These lamps will instead be visually inspected and rejected under "Non-Headlamps", inspection procedures listed below.

Procedures:	Reject Vehicle If:
(1) Low Beam. (a) Low Beam. With the vehicle in the approved inspection area and the test equipment properly calibrated and aligned to the vehicle, switch headlamps to low beam. Follow headlamp aimer's procedures for low beam headlamp alignment. (b) When properly aimed: Edges of high intensity zone-Top edge centered on horizontal centerline. Left edge centered on vertical centerline.	(a) High intensity zone: (i) Left edge is horizontally more than 4 inches right or left of the vertical centerline; or (ii) Top edge is vertically more than 4 inches above or below the horizontal centerline.

(2) High Beam. Required to function, if so equipped. Inspect aim of high beam lamp only if high beam lamp has separate adjustment from low beam lamp.

Procedures:	Reject Vehicle If:
(a) High Beam. Follow same set up procedure as low beam aim-inspection. Switch headlamps to high beam and follow headlamp aimer's procedures for high beam headlamp alignment. (b) When properly aimed, the center of the high intensity zone of the beam pattern is set on the vertical and horizontal centerlines of the lamp.	(a) Center of high intensity zone is horizontally: (i) More than 4 inches right; or (ii) More than 4 inches left of the vertical centerline. (b) Center of high intensity zone is vertically: (i) More than 4 inches above; or (ii) More than 4 inches below the horizontal centerline.

(3) Non-Headlamps. Lighting installed by the vehicle manufacturer and used as headlamps, which are not properly marked as headlamps, excluding multibeam road lighting (high and low beam headlamps) that are improperly marked, or are types of lamps identified as other than headlamps. See Agency Note in §C Headlamps.

Procedures:

Reject Vehicle If:

(a) Non-headlamp. With the vehicle in the approved inspection area and following general headlamp aim inspection procedures previously noted, switch headlamps on and visually inspect headlamps. To assist in visually inspecting headlamp aim, the vehicle should be positioned a minimum distance of 5 feet or further when practical, from in front of a plain vertical surface, for example, bay wall or tool box, etc., to provide a view of the headlamps beam pattern.

(a) Non-headlamp. (i) Fails to emit a white light and function as designed when activated; (ii) Is not properly mounted in vehicle or fails to provide a means of adjustment; (iii) Fails to display an adjusted beam pattern of sufficient intensity determined by visual observation. Examples: Is obviously misaligned permitting the high intensity portion of the beam pattern to be directed in the eyes of on coming drivers, or is unequal in height to the opposite lamp, fails to cast light in the path of vehicle travel, or light emitted from lamp is obviously dim. (iv) Lens is cracked or broken; (v) Is mounted less than 24 inches or more than 54 inches above the level surface on which the vehicle stands measured to the center of the lamp; or (vi) Fails to comply with any applicable required condition of a headlamp noted in this chapter.

D. Fog Lamp and Auxiliary Driving Lamps. Only one spot lamp is allowed. It is not considered an auxiliary driving lamp and has no set mounting height by law. Therefore, it need not be inspected. If a vehicle is equipped with either fog lamps or auxiliary driving lamps, they shall be properly aimed. Fog lamps shall be mounted on the front of the vehicle at a height not more than 30 inches or less than 12 inches above the level surface on which the vehicle stands. Only two fog lamps are allowed by law. Auxiliary driving lamps shall be mounted on the front of the vehicle at a height not more than 42 inches or less than 16 inches above the level surface on which the vehicle stands. Only two auxiliary lamps are allowed by law. The mounting heights of auxiliary driving lamps do not apply to emergency vehicles. Whenever a motor vehicle equipped with required headlamps also is equipped with any auxiliary lamps or a spot lamp or any other lamp on its front, projecting a beam of intensity greater than 300 candlepower, not more than four of these lamps on the front of a vehicle may be lighted at any one time when on a highway.

Procedures:	Reject Vehicle If:
(1) Auxiliary Driving or Fog Lamp Aim-Inspection. Under the same procedures as for headlamp inspection, follow headlamp aimer's procedures for auxiliary or fog lamp alignment. Switch on the lamps and observe color emitted and the location of the high intensity zone. (a) Symmetrical Beam. When properly aimed, the center of the high intensity zone is set 4 inches below the horizontal centerline of the lamp and centered on the vertical centerline. (b) Asymmetrical Beam. When properly aimed, the center of the high intensity zone is set 7 inches below the horizontal centerline of the lamp and centered on the vertical centerline.	(1) Symmetrical Beam: Center of high intensity zone is more than: (a) Horizontally: (i) 4 inches left; or (ii) 4 inches right of the vertical centerline; or (b) Vertically-Less than 4 inches below the horizontal centerline.
(2) Measure height of auxiliary driving or fog lamps. After-market auxiliary driving lamps shall be mounted not less than 16 inches or more than 42 inches above the level surface on which the vehicle stands. Fog lamps shall be mounted not less than 12 inches or more than 30 inches above the level surface on which the vehicle stands.	(2) Asymmetrical Beam. Same as low beam headlamps. Center of high intensity is more than: (a) Horizontally: (i) 4 inches left, or (ii) 4 inches right of the vertical centerline; or (b) Vertically-Less than 7 inches below the horizontal centerline.
(3) Fog lamps or auxiliary driving lamps are mounted higher or lower than allowed. Auxiliary driving lamps mounted on roll bar or roof for off-road use may remain but may not be connected to an electrical source. Reject if: (a) After-market fog lamps are mounted lower than 12 inches or higher than 30 inches; (b) After-market auxiliary lamps are mounted lower than 16 inches or higher than 42 inches; or (c) Fog lamps when lit emit a color other than white or yellow.
(4) Vehicle is equipped with more than two operable fog lamps.
(5) Vehicle is equipped with more than two auxiliary driving lamps.
(6) Vehicle is equipped with more than one spot lamp.

E. SAE Identification Code (J759 SAE Handbook).

Devices marked prior to the adoption of this SAE Specification need not be remarked.

(1) The following list is an identifying code for lights and signaling devices:

Device	SAE Identification Code Designation
Reflex reflector	A
Reflex reflector for use on vehicles 2,032 millimeters or more in overall width	A2
Reflex reflector for conspicuity treatment (CT), for use on vehicles 2,032 millimeters or more in overall width	A3
Reflex reflector for CT (vehicle > 2,032 millimeters width)-50 millimeters wide Truck/Trailer	A4
Reflex reflector for CT (vehicle > 2,032 millimeters width)-75 millimeters wide Truck/Trailer	A5
Reflex reflector for CT (vehicle > 2,032 millimeters width)-100 millimeters wide Truck/Trailer	A6
Reflex reflector for CT (vehicle > 2,032 millimeters width)-25 millimeters wide School bus	A7
Motorcycle auxiliary front lamp	C
Motorcycle and motor-driven cycle turn signal lamp	D
Distributed lighting system (headlamp)	DL
Side turn signal lamp-vehicles (12 meters) or more in length	E
Side turn signal lamp-vehicles less than (12 meters) in length	E2
Siren-interior location	EVS1
Siren-exterior location	EVS2
Siren-under hood location	EVS3
Front fog lamp	F
Fog tail lamps	F2
Truck cargo lamp	G
Sealed beam headlamp	H
Headlamp cleaner	HC
Discharge forward lighting (headlamp)	HG
Sealed beam headlamp housing	HH
Replaceable bulb headlamp	HR
Turn signal lamp spaced greater than 100 millimeters from headlamp	I
Turn signal lamp spaced from 75 millimeters to less than 100 millimeters from headlamp	I3
Turn signal lamp spaced from 60 millimeters to less than 75 millimeters from headlamp	I4
Turn signal lamp spaced less than 60 millimeters from headlamp	I5
Rear mounted turn signal lamp and front mounted turn signal lamps mounted 100 millimeters or more from the headlamp, for use on vehicles 2,032 millimeters or more in overall width	I6
Front mounted turn signal lamp mounted less than 100 millimeters from the headlamp, for use on vehicles 2,032 millimeters or more in overall width	I7
Flasher	J1690
Front cornering lamp	K
Rear cornering lamp	K2
License plate lamp	L
Motorcycle and motor-driven cycle headlamp-motorcycle type	M
Motorcycle and motor-driven cycle headlamp-motor-driven cycle type	N
Spot lamp	O
Parking lamp	P
Side marker lamp for use on vehicles 2,032 millimeters or less in overall width	P2
Clearance, side marker, and identification lamp for use on vehicles 2,032 millimeters or more in overall width.	P3
Combination clearance and side marker lamp for use on vehicles 2,032 millimeters or more in overall width	PC2
Turn signal operating unit-Class A	Q
Turn signal operating unit-Class B	QB
Vehicular hazard warning signal operating unit	QC
Turn signal operating unit for use on vehicles 2,032 millimeters in overall width-Type 1	QD1
Turn signal operating unit for use on vehicles 2,032 millimeters in overall width-Type 2	QD2
Hazard warning operating unit for use on vehicles 2,032 millimeters in overall width-Type 1	QE1
Hazard warning operating unit for use on vehicles 2,032 millimeters in overall width-Type 2	QE2
Reversing (backup) lamp	R
Stop lamp	S
Stop lamp for use on vehicles 2,032 millimeters or more in overall width	S2
Tail lamp (rear position lamp)	T
Tail lamp (rear position lamp) for use on vehicles 2,032 millimeters or more in overall width	T2
Supplemental high-mounted stop and turn signal lamp	U
High-mounted stop lamp for trucks 2,032 millimeters or more in overall width	U2
Center high-mounted stop lamp for passenger cars, light trucks, and MPV's	U3
Warning lamp for emergency, maintenance, and service vehicles	W
Warning lamp for school buses	W2
Optical warning device-Class 1	W3-1
Optical warning device-Class 2	W3-2
Optical warning device-Class 3	W3-3
Emergency warning device (triangular shape)	W4
360 degree gaseous discharge lamp-Class 1	W5-1
360 degree gaseous discharge lamp-Class 2	W5-2
360 degree gaseous discharge lamp-Class 3	W5-3
Adaptive (forward) lighting system	X
Auxiliary high beam lamp	Y
Daytime running lamp	Y2
Auxiliary low beam lamp	Z

(2) All equipment for testing headlamps shall comply with the Society of Automotive Engineers Recommended Practice for Headlamp Inspection Equipment.

Md. Code Regs. 11.14.09.09

Regulations .09 adopted as an emergency provision effective January 1, 2006 (33:4 Md. R. 349); emergency provision extended at 33:15 Md. R. 1275; emergency status expired December 28, 2006
Regulations .09 adopted as an emergency provision effective March 9, 2007 (34:9 Md. R. 824); emergency provision expired September 5, 2007
Regulations .09 adopted effective September 10, 2007 (34:18 Md. R. 1580)