Bureau of Transportation Statistics (BTS)
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TABLE 2 - Gap Size of Platooning Vehicles in Work Zones

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Pattern Frequency (vph) Mean gap (seconds) Mean headway (seconds)
A. Short-Term Work Zone      
Car-car 1,087 1.610 1.986
Car-truck 209 2.030 2.429
Truck-car 374 1.805 2.672
Truck-truck 157 2.021 2.960
B. Long-Term Work Zones      
Car-car 1,392 1.384 1.736
Car-truck 311 1.824 2.164
Truck-car 603 1.645 2.285
Truck-truck 384 1.865 2.578

Key: vph = vehicles per hour.

Note: The measured average speeds of platooning vehicles were 39.80 mph in short-term work zones and 50.78 mph in long-term work zones.