(A) Driveways.
(1) If feasible, the distance from the proposed driveway to the nearest existing or proposed traffic signal on a highway or street, within one mile, shall be a multiple of the critical spacing for a progressive signal system. The critical space is calculated by the following formula:
X = S (½ C) 1.47
where
X = critical space in feet
S = approach speed, 50th percentile, MPH
C = total cycle of existing signal in seconds
In applying the critical space, a tolerance of 10% plus or minus is acceptable.
(2) A new driveway shall not be located where it will create an offset intersection opposite an existing street, highway or major commercial driveway.
(3) A driveway serving all directions of traffic shall be located a minimum of 600 feet from the nearest major highway or street intersection.
(4) Driveways shall intersect the highway at an angle between seventy degrees and ninety degrees.
(5) Each driveway traffic lane shall have a minimum width of ten feet, with 12 feet preferred.
(6) Major driveways in shopping centers shall be constructed to prevent cross movement of internal traffic within 100 feet of the entrance approach. This may be accomplished by use of a raised divider, six inches high, six feet wide minimum and 100 feet long and/or by use of curbing, sidewalk or other barrier along the drive edges for a length of 100 feet.
(7) Driveways designed for traffic signal operation shall have curbed radii and shall provide a minimum of two lanes for vehicles entering a city highway.
(B) Drainage.
(1) The developer of the area shall not cause any diversion of flow to the highway.
(2) The developer of the area shall not increase flow peaks from areas contributing to the highway unless the highway drainage system and the drainage system downstream from the highway area are of adequate capacity to convey the augmented flow. If downstream, capacity is inadequate, the developer shall provide adequate flow detention or increase the capacity of the downstream system.
(3) When the developer collects and concentrates surface water, or increases flow peaks or volumes contributing to this highway, he shall provide adequate measures to prevent erosion and/or structural damage of the downstream system.
(4) The developer of the area shall provide adequate erosion control measures during construction to minimize downstream sedimentation.
(5) The developer shall submit drainage plans and calculations for approval by the City Engineer.
(Ord. 116-87, passed 12-28-87)