§ 419-17. Roadway access design.

All Village roadways shall be designed and located in accordance with the standards established in this chapter. The design of all accesses shall be consistent with the adopted roadway design standards or the standards established by the Village Board.

A. 

Alignment. New roadways shall abut the public roadway within 2° of perpendicular to the accessed roadway centerline for the first 60 feet of the roadway.

(1) 

Where possible, roadways shall align on opposite sides of the roadway. Where offset access is needed due to certain site limitations, the same spacing criteria should be followed to ensure reduced conflict and safe left turning onto the roadway.

(2) 

A variance is required for site-specific limitations that may exist which restrict the applicant from complying with these dimensional requirements.

B. 

Vision triangle.

(1) 

No visual obstruction shall be located within a vision triangle, or the space formed by two existing or proposed right-of-way lines and/or a right-of-way to a private driveway. No structure or sign may be placed in the clear area of a vision triangle. The clear area extends from 18 inches to 10 feet above from the average height of the right-of-way elevation of the adjoining streets and/or an existing or proposed access/driveway. These constraints are depicted by Figure 419-17A.

(2) 

Vision triangle clearance distance measured from the edge of paved or aggregate roadway surface. Figure 419-17B depicts the vision triangle and distances based on the functional classification of roadways being accessed.

Figure 419-17A

Vertical Clear Sign Area

Figure 419-17B

Vision Triangle Diagram

C. 

Sight distance.

(1) 

Permits shall not be issued for roadways that allow any turning movement where the sight distance is not sufficient to provide for the safe and efficient traffic flow entering or exiting a Village roadway, or encountering the access while upon the roadway.

(a) 

These sight distance standards make assumptions based on observed tendencies among motorists: a driver's eye height being 3.5 feet above the access surface and that the object to be seen being 3.5 feet above the intersecting roadway surface.

(b) 

The standards are defined for a two-lane roadway that is maintained all four seasons.

(2) 

The owner shall be responsible for clearly demonstrating that the proposed roadway conforms to the sight distance standards set forth in this chapter.

(a) 

In the event that it is impractical to remove, alter, or relocate an object affecting the sight distance, the Village Board shall elect to install traffic control devices or design features to remedy the issue.

(b) 

At the discretion of the Village Board, a proposed roadway with site-specific sight distance issues may be further reviewed by Village staff, at the expense of the owner. It may be to the benefit of the owner that a licensed engineer should provide a sight distance design of the access proposal.

Table 417-17C. Minimum Sight Distance for Uncontrolled Intersections
Posted Speed (miles per hour)	Minimum Sight Distances (feet)
25	115
30	140
35	165
40	195
45	220
50	245
55	285

Table 417-17D. Minimum Sight Distances Based on Vehicle Maneuver
Vehicle Speed (miles per hour)	Stopping Sight Distance for Left-Turn Maneuver (feet)	Stopping Sight Distance for Crossover and Right-Turn Maneuvers (feet)
25	280	240
30	335	290
35	390	335
40	445	385
45	500	430
50	555	480
55	610	530

Figure 417-17E.

Sight Distance Diagram

(3) 

Sight distance. Intersection sight distance, as determined by the Director of Public Works, using the vision triangle shall be required in conjunction with intersection setbacks to ensure safety and functionality on Village roadways. The intersection sight distance figures are defined for both uncontrolled intersections along with those where vehicles approach the intersection from a stop or yield.