تحديد قيمة الطول الحرج في الميول الطولية الصاعدة للطرق ذات حارتي المرور

Abstract EN

Critical Lengths of Grade is the length of graded road that a vehicle can pass without significant reduction in its speed.

(i.e.

reduction should not exceed 15 km/hr).

If the length of upgraded road exceeds the critical length, an additional lane must be added for decelerating heavy trucks (this lane is called climbing lane).

Codes give the critical length by charts or tables depending on specific speed.

For example, 110 km/h speed is considered as entering in AASHTO code.

Therefore, it's necessary that determining the value of critical length by general and simple relationship.

In this research, a relationship was obtained depending on the main principles of dynamics.

Also, the derived formula was evaluated.