Effect of Speed on Placement Distances
The posted speed is the primary criteria for the longitudinal placement of signs. Speed is divided into low-speed roadways (speed ≤ 40 mph) and high-speed roadways (speed ≥ 45 mph).
The distances shown in the figures in this chapter are for highways with speeds of 45 mph or greater. For highways with speeds of 40 mph or less, signs may be placed closer to the intersection. Table 5-1 identifies the high-speed and low-speed placement distances for each type of sign that could be used on an approach to an intersection.
Placement Distance for Speed Condition 1 (Distance from near edge of intersecting roadway) | Type of Sign | |
|---|---|---|
Low-Speed (≤ 40 mph), ft 2 | High-Speed (≥45 mph) ft 3 | |
6-50 | 6-50 | Directional Assembly or Stop Sign |
260-400 | 325-500 | Reserved for Future Use |
520-660 | 650-825 | Destination Sign |
780-920 | 975-1150 | Advance Traffic Control Sign |
1040-1180 | 1300-1475 | Advance Route Turn Assembly |
1300-1440 | 1625-1800 | Junction Assembly |
1560-1700 | 1950-2125 | Highway Intersection Sign or Intersection Warning Sign |
Notes: 1 A sign installation should not be moved closer to the intersection if another sign is not used. In other words, the Junction assembly should always be 1625-1800 ft from the intersection, even if the Advance Route Turn assembly is not installed.2 Generally rounded to the nearest 10 ft.3 Generally rounded to the nearest 25 ft. | ||