In general and except as otherwise stated elsewhere, lamp units shall be provided to give an indication in both directions along the highway. Local conditions, such as one-way highway traffic, etc., may require a different arrangement. The lamp units shall be equipped with peepholes in the sides. Hoods should be used on peepholes, except in special cases where they may interfere with a train crew's observation of the light emanating therefrom.
Ill. Admin. Code tit. 92, § 1535.340
Amended at 29 Ill. Reg. 20376, effective December 15, 2005