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2007-05-30T18:43:17Z

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Appropriate signal spacing is needed to preserve efficient traffic flow and progression on urban arterial roadways; for instance, a quarter- or half-mile spacing allows traffic signals to be effectively interconnected and synchronized. Adequate spacing will also tend to reduce rear-end collisions and “stop and go” driving that increases congestion, delay and air pollution. In urban areas, these guidelines were developed to allow for smooth operations given a 90-second total traffic signal cycle length.

[[image:940.6.gif|475px|center|thumb|<center>'''Minimum spacing between traffic signals on public roads'''</center>]]

{| border="1" class="wikitable" style="margin: 1em auto 1em auto"
|+ '''''Table 940.6 Minimum Guidelines '''''
! style="background:#BEBEBE"|Roadway Classification !! style="background:#BEBEBE"|In Current and Projected Urban Areas!! style="background:#BEBEBE"|In Rural Areas
|-
! Major, Freeway
| Traffic signals not allowed || Traffic signals not allowed
|-
!Major, Non-Freeway
| ½ mile (2,640 ft.) – 1 mile (5,280 ft.)|| See note below*
|-
!Minor
|¼ mile (1,320 ft.) - ½ mile (2,640 ft.)|| See note below*
|-
| colspan="3"|* Rural traffic signals are generally isolated signals rather than signals placed in a progression along a route. Signals are to be placed at least 5,280 ft. apart because of high rural operating speeds.
|}

[[category:940 Access Management|940.06]]

940.6 Traffic Signal Spacing - Revision history

Smithk: article construction