Section 250-155-8 - COMMON PERMIT FORM1. A single permit will be issued by the Issuing State for travel in all the Agreement states required by the envelope vehicle.2. A permit issued under the Agreement will be valid for five working days for use by the permitted envelope vehicle.3. Based on the experience of the states and an analysis of limited data, it was concluded there is a relatively low frequency of current requests for substituting hauling components after a permit has been issued. Therefore, handwritten substitutions for the truck tractor and/or trailer will be allowed only for such extraordinary circumstances that may be required by mutual agreement upon communication by telephone with the Issuing State permit office. The names of both parties will be exchanged as well as the reason provided for the requested change, and each party will note this modification on their respective copies of the permit. Those extraordinary circumstances will almost always be caused by a mechanical failure.4. Similarly, it is not anticipated that there will be a need for extending the time period beyond five working days. However, extensions for very short periods will be granted for extenuating circumstances, normally not exceeding one day or for a specific day, by mutual agreement via telephone and handwritten modifications. The names of both parties will be exchanged as well as the reason provided for the requested change, and each party will note this modification on their respective copies of the permit.5. The Common Permit Form will be used only to issue permits in accordance with the Agreement. Individual state permits must be obtained for any required permit travel not covered by this Agreement.6. The permit must be carried by the operator of the vehicle at all times and must be available for inspection in each Agreement State.29- 250 C.M.R. ch. 155, § 8