Examkin

Soru

Zorluk: OrtaSpace Ahead and Following Distance

A commercial driver operates a 35-foot35\text{-foot} municipal transit bus at a steady speed of 45 mph45\text{ mph} on a dry, level expressway under ideal weather conditions. Based on the standard commercial driver space management formula, what is the minimum safe following distance, in seconds, the driver must maintain behind the lead vehicle?

Cevap: 4.5 seconds

Cevap

4.5 seconds
According to the official commercial driving handbook, a driver must maintain at least 1 second of space ahead for every 10 feet of vehicle length at speeds below 40 mph. For a 35-foot bus, the base interval is 3.5 seconds. Because the bus is traveling at 45 mph (at or above 40 mph), 1 additional second must be added to provide adequate stopping cushion, yielding a total of 4.5 seconds.

Adım Adım Çözüm

1
Determine the base time allocation for vehicle length
3.5 seconds
Standard CDL guidelines require at least 1 second for every 10 feet of vehicle length.
2
Evaluate the operating speed adjustment
Add 1.0 second
Speeds of 40 mph or greater require adding 1 additional second to account for longer braking distances.
3
Calculate the total required following distance
4.5 seconds
Sum the base length interval (3.5 seconds) and the speed adjustment buffer (1.0 second).

Anahtar Kavram

CDL Following Distance Rule: 1 second per 10 feet of vehicle length plus 1 additional second for speeds at or above 40 mph
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Space Ahead and Following Distance

Bu konudan daha fazla soru