(a) Driveway widths and turning radii are determined by the number and use of lanes on the driveway and the design vehicle chosen for the driveway. The width and radii of the driveway shall permit vehicles to enter and exit with a minimum of interference to through traffic, yet be restrictive enough to discourage erratic maneuvers. The following table provides guidelines for driveway dimensions based on driveway type and design vehicle.
Driveway Type | Residential | Commercial | Industrial/Retail | |||
Design Vehicle | P | SU-30 | WB-50/WB-67 | |||
Nominal Width 1/ | Min. (feet) | Max. (feet) | Min. (feet) | Max. (feet) | Min. (feet) | Max. (feet) |
One-way Drive | 10 | 14 | 14 | 20 | 14 | 26 |
Two-way Drive | 20 | 24 | 26 | 32 | 26 | 38 |
Corresponding RT Radius | 25 | 15 | 35 | 25 | 75 | 50 |
1/ Driveway throat width measured parallel to highway and clear of the turn radii.
P: Passenger car
SU-30: Single-unit truck; 30 feet in length
WB-50: Large semi-trailer truck; 55 feet in length
WB-67: Interstate semi-trailer truck; 74 feet in length
RT Radius: Right turn radius (Note: the smaller the drive width, the larger turn radius required to accommodate the path of the vehicle.)
(b) Driveways that enter a public roadway at traffic signals shall have the number of lanes as determined by a capacity analysis. In this case, 12-foot wide lanes shall be utilized and turn templates shall be used to ensure adequate radius-throat width combinations.
(c) Two-way driveways shall intersect the highway at an intersection angle between 70º and 90º. An angle less than 70º will not be permitted on new two-way driveways. One-way operation driveways (right in only or right out only) shall not have an angle less than 45º.
(d) Driveway radii may be reduced on a roadway with on-street parking. The turn radius, in such a case, is measured from the edge of the through lane.
(e) The profile of a driveway shall be designed to provide a smooth transition for its users.
(f) Drives shall not be obstructed within the right-of-way by gates, or similar obstacles. Any access with a gate shall be designed so that the longest vehicle can completely clear the traveled way when the gate is closed and as it is opened.
(g) The need for traffic signals shall be determined by warrant analyses using the Ohio Manual of Uniform Traffic Control Devices.
(h) High volume driveways that do not meet signal warrants may be denied certain traffic movements if traffic volumes and conditions on the highway would make the full movement operation unsafe. (Ord. 04-05. Passed 3-2-05.)