Illinois Administrative Code › Title 92 - TRANSPORTATION › Part 550 - POLICY ON PERMITS FOR ACCESS DRIVEWAYS TO STATE HIGHWAYS › Section 550.80 - Industrial-Commercial-Recreational High-Volume Traffic Generator Driveway Requirements (Illustration G)

Current through Register Vol. 48, No. 28, July 12, 2024
a) This
			 category is for industrial or commercial complexes that generate high-volume
			 traffic, such as shopping centers, office buildings, apartment or residential
			 complexes, and also includes recreational facilities, such as racetracks,
			 athletic parks, and drive-in theaters.
b) It is difficult to establish standards for
			 these types of driveways because of the uniqueness of each one and the critical
			 effect each may have on the operation of the highway onto which the driveway is
			 to be constructed. They should meet the standards for public road intersections
			 with corresponding traffic, although each such entrance will need to be
			 individually designed.
c) It is
			 recommended that a preliminary meeting between the developer and the Department
			 be held to discuss entrance location prior to the final arrangement of
			 buildings, internal driveways, and parking facilities within the entire
			 development.
d) The permit request
			 must be accompanied with the final site layout and other information necessary
			 to review the proposed entrances. Traffic and drainage studies may also be
			 needed.
e) The following general
			 requirements will pertain to these types of driveways.
1) Width of Drive. A driveway for these types
			 of developments may have a maximum width of 35 feet when undivided or may
			 consist of two 24-foot drives, one for entering and one for exiting traffic,
			 divided by a median. The entrance to the development shall be designed to avoid
			 backing up traffic on the highway so that traffic waiting to enter into the
			 facility blocks through traffic. The number of lanes exiting from the
			 development and turning in one direction shall not exceed the number of
			 available traffic lanes on the highway in that direction. For example, if the
			 exit is on a two-lane two-way pavement, no more than one lane will be allowed
			 to exit at the same time in each direction.
2) 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. The radii will generally be between
			 30 and 50 feet, except that three-center curves, with or without island, may be
			 required. Vehicle turning paths should be used to design the flares to prevent
			 vehicles using the driveway from encroaching outside the right lane of the
			 highway.
3) Angular Placement. The
			 center line of a two-way driveway shall either be at a right angle to the
			 roadway or parallel to the property line. The angle of the center line of the
			 driveway is 60 degrees for a two-way driveway or 45 degrees for multiple
			 entrances where the driveways will be used for one-way traffic.
4) Location.
A) A minimum distance of 10 feet shall be
			 maintained between a property line and any part of the driveway flare. The
			 distance between the beginning of the driveway flare and the near edge of an
			 adjacent roadway intersecting the State highway shall be 100 feet. Where volume
			 projections indicate a need, sufficient distance from adjacent roadways or
			 property lines should be allowed for the construction of a right or left-turn
			 lane.
B) If multiple drives are
			 provided for these facilities, sufficient distance must be allowed between
			 entrances for the construction of turning lanes. This will also result in
			 separating the points of conflict created by such entrances and will encourage
			 internal circulation. A minimum distance of 440 feet between the center lines
			 of adjacent entrances will be required for these purposes.
5) Medians. Where a divided entrance
			 separating entering and exiting traffic is utilized, the median shall be
			 between 4 and 18 feet wide and extend into the property as far as necessary to
			 promote smooth traffic patterns. The median shall begin at the edge of the
			 normal shoulder in an uncurbed section or 4 to 10 feet from the face of the
			 curb in a curbed section.