Ill. Admin. Code tit. 92, § 550.70 - Commercial Driveway Requirements (Illustrations E and F)
a) Width of Drive. All commercial driveways
shall be limited to a maximum width of 35 feet measured at right angles to the
center line of the drive, exclusive of flares. The width may be increased by
permissible radii to allow for smooth ingress and egress at the highway
connection. The maximum permissible width for rural locations shall be 60 feet
measured along a line 6 feet from and parallel to the roadway edge. For urban
locations, the maximum width shall be 85 feet measured at the face of the
curb.
b) Radius of Flare . The flare
used to connect the driveway to the roadway shall normally fall entirely within
the right-of-way. It may be permitted to go outside the right-of-way if raised
curbing extends into the private property. In rural locations, the radii shall
be between 10 and 40 feet, while in urban cases they shall be between 10 and 25
feet. In special cases, after consideration of the right-of-way width, proposed
volumes, types of vehicles, speeds on the roadway, and parking regulations,
radii outside these ranges may be permitted to allow for the efficient use of
the driveway. The geometrics necessary for smooth operation of the driveway may
require the use of modified radii flares or three-center curves with or without
island.
c) Angular Placement. The
center line of a single driveway that services a commercial property should
generally be at a right angle to the roadway or parallel to the property line.
The angle of the center line with the roadway may be reduced to 60 degrees for
two-way driveways or 45 degrees for multiple entrances where the driveways will
be used for one-way traffic. Angled driveways may be allowed for high-speed
roadways and/or large volume movements.
d) Location.
1) Sufficient distance must be maintained
between the property line and the edge of the driveway to allow for the
construction of an adequate island between drives should the adjacent property
owner desire to build an entrance. In rural locations, this distance shall be
measured along a line 6 feet from and parallel to the roadway edge and should
be a minimum of 5 feet. In urban situations, a curb length of not less than 3
feet shall be left undisturbed adjacent to each property line.
2) All commercial driveways shall be located
to provide a specified minimum distance from the intersecting public roads.
This distance shall be measured along a line parallel to but not greater than 5
feet from the pavement edge. For rural locations, the minimum distance between
the beginning of the flare and the edge of the intersecting road shall be 50
feet. At urban locations, the beginning of the flare must be at least 5 feet
from the extension of the near right-of-way line of the intersecting road. In
no case shall the distance between the point at which the edge of the driveway
intersects the pavement edge and the line of the through traffic lane extended
be greater than 5 feet. Where a separate right-turn lane is provided, no part
of the lane taper shall encroach on the highway flare .
e) Islands. Where a commercial establishment
is serviced by more than one driveway, an island separator shall be provided
and maintained between drives. The back edge of this island measured along the
right-of-way line should have a minimum length of 10 feet for rural and 6 feet
for urban locations. The island width 6 feet from the edge of the highway must
also meet these minimums. Where the island is less than 25 feet long or less
than 10 feet in width, its shape shall be defined by the use of concrete curb,
masonry, or other devices to restrict the path of vehicles using the
driveways.
Notes
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