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Zorluk: OrtaSpace Ahead and Following Distance

While driving on a dry rural highway in daylight, a driver operates a 45-foot45\text{-foot} flatbed commercial truck at a steady cruising speed of 45 mph45\text{ mph}. According to standard commercial vehicle safety guidelines, what is the minimum safe following distance, in seconds, that should be maintained behind the vehicle ahead?

Cevap: 5.5 seconds

Cevap

5.5 seconds
According to standard commercial driver licensing guidelines, the basic following distance formula requires 1 second for every 10 feet of vehicle length at speeds under 40 mph, plus 1 additional second when driving at or above 40 mph. For a 45-foot commercial truck, the base interval is 4.5 seconds (45÷10=4.545 \div 10 = 4.5). Because the vehicle is traveling at 45 mph (at or above 40 mph), an additional 1.0 second must be added, resulting in a minimum safe following distance of 5.5 seconds (4.5+1.0=5.54.5 + 1.0 = 5.5).

Adım Adım Çözüm

1
Calculate the base following distance based on vehicle length
4.5 seconds
The commercial driving standard requires 1 second of following distance for every 10 feet of vehicle length.
2
Evaluate the operating speed and determine if the high-speed safety buffer applies
+1.0 second
For operating speeds at or above 40 mph, drivers must add 1 additional second to their total following cushion.
3
Sum the base following distance and the speed adjustment buffer
5.5 seconds
Combining 4.5 seconds of length-based headway and 1.0 second of speed-based headway yields the total minimum required space cushion.

Anahtar Kavram

CDL Following Distance Rule (1 second per 10 feet of length, plus 1 second for speeds 40 mph and above)
Tahmini Süre:1m 0s
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Konular

Space Ahead and Following Distance

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