This paper develops models to calculate an upper limit on per-lane throughput for an automated highway system with mixed vehicle classes and platooned operation. The models arc analytical and based on independent arrivals among the classes. The results indicate that a mixture of vehicle classes or categories can have u significant detrimental effect on vehicle capacity. With a single entrance lane, capacity drops by more than 40% when the traffic stream moves from 100% light vehicles to a 90%/10% split between light and heavy vehicles. The capacity drop is substantially less when different classes are allowed to queue in separate lanes, but still significant (a 20% drop). It also does not appear that sorting vehicles into destination groups at the point of entry is an effective strategy to enhance exit capacity. A separate model was developed to evaluate capacity losses at the point of exit, where exiting vehicles must be separated by a minimum distance that exceeds normal intra-platoon requirements. Our results show that capacity losses are moderate (10% or less) when less than 20% of vehicles exit at any particular off-ramp.
Lane Capacity for an Automated Highway with Mixed Vehicle Classes
Journal of Intelligent Transportation Systems ; 5 , 3 ; 217-240
1999-01-01
24 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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