DESIGN FOR ON-SITE VEHICULAR CIRCULATION AND PARKING
Table 6-1. Dimensions (in Feet) for Design Vehicles
(for Non-organizational Vehicle Parking).
This chapter provides general guidelines and crite-
ria, or standards, for determining the size, layout,
and design of on-site vehicular circulation and
Design Vehicle (Symbol)
parking. The chapter covers access and service
Passenger Car (P)
drives; parking areas; and special vehicle-use ar-
eas including gateways, drop-offs, dumpsters, de-
Single Unit Truck (SU)
liveries, and drive-in facilities. This chapter also
addresses methods for mitigating the visual im-
pact of parking and other vehicle use areas.
MTMC provides detailed information on all as-
pects of circulation design.
Single Unit Bus (BUS)
6-2. Design Vehicles.
Motor Home (MH)
A variety of vehicles can be expected on any site.
Motor Home & Boat
These include cars, pick-up trucks, garbage trucks,
delivery vans and trucks, buses, recreation vehi-
cles, fire trucks, oversized or tracked organiza-
Table 6-2. Minimum Turning Radii (in Feet)
for Design Vehicles.
and exits should be designed to accommodate the
largest vehicle using the site. Other areas (e.g,
parking lots or loading docks which have special
requirements) should be designed for the largest
vehicle using the area.
a. Vehicle Dimensions
and Turning Radii.
Single Unit Truck
Policy on Geometric Design of Highways and
Streets, the American Association of State High-
way and Transportation Officials (AASHTO) places
vehicles into three general classes: passenger cars,
Single Unit Bus
trucks, and buses/recreation vehicles. The passen-
ger car class includes light delivery trucks such as
vans and pick-ups. Table 6-1 lists dimensions for
Motor Home & Boat Trailer
some of the more commonly found vehicles. Table
6-2 lists minimum turning radii for the same
6-3. Access and Service Drives.
vehicles. AASHTO provides an expanded list with
Access drives carry all vehicular traffic on site.
additional dimensions and information. For the
They should be designed to accommodate the full
purposes of design, the design vehicles have larger
range of vehicles. Service drives are limited to
physical dimensions and larger minimum turning
radii than almost all vehicles in their classes.
special vehicle traffic. They should be designed to
b. POV Vehicles. The AASHTO passenger car is
accommodate the particular vehicle.
a. Spacing. Location of access drives should
equivalent to a non-organizational or POV vehicle.
follow these spacing guidelines:
Figure 6-1 illustrates a turning template showing
(1) Maintain 200' or more between access
the turning paths and radii of a POV vehicle.
drives on arterial roads. Table 6-3 provides accept-
AASHTO provides turning templates for the other
able minimum spacing if this is not possible.