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December2006 INTERSECTIONS AT-GRADE 11-2(7)
' Design Speed ISD(ft)
Nam)
(mph) Passenger Cars Single-Unit Trucks Tractor/Semitrailers
20 240 300 360
25 295 375 450
' 30 355 450 540
35 415 525 630
40 475 600 720
' 45 (o 675 810
50 590 750 900
' 55 650 825 990
60 710 900 1080
' 65 765 975 1170
70 825 1050 1260
' Nbl"o
1. Thew ISD wahms assum a W or nght kwn onto a 2-kww facft but a metes.
' z These ISD values assume,a mirror road approach gee less Ehan or equal to 3%
' 3. These ISD Values assume the kft-fttssirrg V+ehwfe%*ester Ilse Inside Eravel lane on the
far Ede of the nwicrmd
4. For a right Eons from a n*w road)(i e., ISD to Me left), use the ISD values pn3ser W in
' Figure 11 2G
' INTERSECTION SIGHT DISTANCES
(FOUR-LANE HIGHWAY WITHOUT MEDIAN)
' Figure f 1 2D
C-1