Union Township City Zoning Code
§ 30-22.12
Intersections.
[Ord. No. 85-9, § 2211; Ord. No. 2001-8, § 5]
a.
Corner Sight Distance (Clear Sight Triangle).
1.
Whenever a proposed street intersects an existing or proposed street of higher order in the street hierarchy, the street of lower order shall also be designed to provide a minimum corner sight distance as specified below:
All site distance calculations shall be performed according to the American Association of State Highway and Transportation Officials (AASHTO), "Policy on Geometric Design of Highways and Streets," latest edition.
 |
B (Height of Driver's Eye) | = | Eye level from a car stopped at the intersection on the secondary street; for the ordinance, B is situated 3.5 feet above the roadway area, 20 feet from the edge of the paving of the primary street |
Y (Required Stopping Sight Distance) | = | The distance from Point A to Point C and Point C to Point D shall be the required stopping sight distance as calculated and described in Chapter 3 of the AASHTO Policy on Geometric Design of Highways and Streets |
A and D | = | A point 6 inches above the pavement centerline of the primary street |
C | = | Approximate center of intersection |
2.
The entire area of the clear sight triangle, described in points ABC above, shall be designed to provide an unobstructed view across it from point B to all points 4.5 feet along the centerline from point A to point C and D above the roadway along the centerline from point A to point C and D. An unobstructed view for a minimum of 10 feet measured horizontally from the top of the curb elevation within the sight triangle shall be maintained.
b.
Curb Radius. Minimum curb or edge of pavement radius shall be determined according to the specifications for the street of higher classification in the street system hierarchy, as specified below:
Residential Subcollector | 10 feet |
Residential Collector | 15 feet |
Existing Streets | 40 feet |
c.
Intersection Spacing. Proposed streets which intersect opposite sides of another street (either existing or proposed) shall be laid out to intersect either directly opposite each other, or with a minimum offset or spacing measured from centerline to centerline as specified below.
Minimum Intersection Spacing | |
|---|---|
Major Road Type | Spacing (in feet) |
Existing Streets | 1,600 |
Residential Collector | 300 |
Residential Subcollector | 125 |
d.
Intersection Angle. Intersecting roads shall intersect at a 90° angle for a minimum of 50 feet from the intersection beyond the intersection of the right-of-way lines.
e.
Turning Lanes. Deceleration or turning lanes may also be required by the Township along existing and proposed collector and/or arterial roads whenever these intersect other collector or primary roads.
1.
Deceleration or turning lanes may also be required by the Township along existing and proposed streets as determined by a traffic impact study required in § 30-22.20.
2.
Deceleration lanes shall be designed to the following standards:
(a)
The lane width shall be the same as the required width of the roadway moving lanes.
(b)
The lane shall provide the full required land width for its full length. It shall not be tapered.
(c)
The minimum lane length shall be as follows:
Design Speed of Road | Minimum Deceleration Lane Length |
|---|---|
30 mph | 165 feet |
40 mph | 230 feet |
50 mph | 310 feet |