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- State of Wisconsin Department of Transportation . , %IIII►►►\\\ ilities Development Manual Fac p ORIGINATOR PROCEDURE Director, Bureau of Highway Development 11-25-1 CHAPTER 11 Design SECTION 25 Intersections at Grade SUBJECT 1 General Selection of Intersection Criteria • The function of the through highway. If it serves to connect urban areas, An intersection may be designed to there is the potential for strip either rural or urban design criteria development to occur along the depending on its location and the type of highway or adjacent frontage roads. development existing or expected in the Traffic from this development will feed area. An intersection located to serve a into the cross road. present or future residential or commercial Commercial or industrial zoned areas area should be designed to urban • standards with specific consideration of may attract truck terminals or other the current or eventual need for traffic truck generators. signals, cross walks, pedestrian signals, Rural Intersections expected traffic volumes and size of The latest edrtxons of SDK's 9A1 a & b vehicles expected. Designers should (English and 1Tie.ii4 illustrate five types of consult with the district planning staff to rural at-grade intersection: A, B1, B2, C determine the type of development and D. Figure 1 lists the criteria for using expected in the area of the intersection. each type of intersection. Specific factors and features to Passing Lane: To be used on all T- consider are: intersections of Type A. A passing lane • Current and expected traffic volume may be used on the other intersection on the cross road. Traffic signals may types when warranted by high turning be warranted in outlying or rural areas volumes or unusual traffic conditions. to satisfy Warrant 2, "Interruption of Median Openings and Left Turn Continuous Traffic" as defined in Part Lanes: See procedure 11-25-5. IV of the MUTCD when the two way Sight distance requirements for at- traffic volume on the cross road grade intersections is discussed on pages reaches approximately 1500 ADT. A 739 to 772 of the GDHS. A value of 8 current traffic volume of 1000 ADT or seconds or more should be used for U = more can be an indicator that there Ta) for the Case IIIA, crossing maneuver may be a potential need for signals explained on page 746 of the GDHS. within about 10 years where the traffic volume on.the main highway also Urban Intersections meets the warranting criteria. At-grade urban intersections are made • The length of the cross road available up of a variety of types that cannot be for traffic generating development including potential extensions. Date November 8,1996 Page 1