See Exhibit 2-2 for Minimum Turning Radii of design vehicles. Primary dimensions affecting design are minimum centerline turning radius (CTR), out-to-out track width, the wheelbase, and the path of the inner rear tire. WB-20 (WB-65 or 67) Intersections of freeway ramp terminals with arterial crossroads and intersections on state highways and industrialized streets that carry high volumes of traffic and/or that provide local access for large trucks.Ħ Minimum Turning Paths of Design Vehicles Single Unit Truck (U) Intersections on residential streets and park roads CITY-BUS State highway intersections with city streets designated as bus routes and having relatively few large trucks using them S-BUS 11 or S-BUS 12 Intersections of highways with low volume county highways and township/local roads < 400ADT, and intersections on subdivision streets.
CALTRANS PAVEMENT DESIGN SOFTWARE SERIES
Passenger Car (P) A parking lot or a series of parking lots. Motor Home and Boat Trailer (MH/B) 19.ğarm Tractor (TR)ĭesigners should consider the largest design vehicle likely to use that facility with considerable frequency or a design vehicle with special characteristics appropriate to a particular intersection in determining the design of such critical features as radii at intersections and radii or turning roadways. Motor Home (MH) 16.Ĝar and Camper Trailer (P/T) 17.Ĝar and Boat Trailer (P/B) 18. Turnpike Double-Semitrailer/Trailer (WB-33D) 15. Interstate Semitrailer (WB-20) 12.ĝouble-Bottom-Semitrailer/Trailer (WB-20D) 13. Large School Bus (84 passengers) (S-BUS 12) 7.Ěrticulated Bus (A-BUS) 8. Intercity Bus (Motor Coaches) (BUS-12, BUS-14) 4.Ĝity Transit Bus (CITY-BUS) 5.Ĝonventional School Bus (65 passengers) (S-BUS 11) 6. Bicycle is considered as a design vehicle where it is allowed on a highway.Ĥ Design Vehicles These 19 design vehicles are: 1. There are 19 not 15 design vehicles in four groups of design vehicles: Passenger Cars, Buses, Trucks, and Recreational Vehicles. The largest design vehicles are usually accommodated in freeway design. Each design vehicle has larger physical dimensions and a larger minimum turning radius than most vehicles in that class. Design vehicles are the selected vehicles with representative weight, dimensions, and operating characteristics used to establish highway design controls for accommodating vehicles of designated classes.
CALTRANS PAVEMENT DESIGN SOFTWARE DRIVERS
Besides the highway functional classification, other important design controls and criteria are as follows: Vehicles Design Vehicles, Physical Characteristics and performance Drivers and PedestriansĜharacteristics of Drivers and Pedestrians, Performance of Drivers and Pedestrians Traffic Design Speed, Design LOS, Traffic Volume, Design Hourly Volume, Peak Hour Factor, Design Designation, etc.įunctional Classification Traffic Data Terrain Locale Design Speed Lane width, rural X Lane width, urban Rural shoulder width, type Urban shoulder width, type Guard Rail offset Degree of curve Grades Bridge clearances (horizontal & vertical) Stopping sight distance Superelevation Widening on curves Rural design speeds Urban design speedsģ Design Vehicles Key controls in geometric design are the physical characteristics and proportions of vehicles of various sizes using the highway.
In order to design highways, the designers must have an understanding of the basic design controls and criteria associated with the highways.
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