36 CFR § 4.13 - Obstructing traffic.

§ 4.13 Obstructing traffic.

The following are prohibited:

(a) Stopping or parking a vehicle upon a park road, except as authorized by the superintendent, or in the event of an accident or other condition beyond the control of the operator.

(b) Operating a vehicle so slowly as to interfere with the normal flow of traffic.

The following state regulations pages link to this page.