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Supervisors place intersection of Aviation and Mission roads on priority list for signal

The San Diego County Board of Supervisors voted to place the intersection of Aviation Road and Mission Road on the county’s Traffic Signal Priority List.

The supervisors’ 5-0 vote June 23 ratifies an April 23 recommendation of the county’s Traffic Advisory Committee. The actual installations of signals for intersections on the Traffic Signal Priority List are based on priority points for safety and operational improvements rather than on the length of time the signal has been on the priority list, and the TAC along with the county’s Department of Public Works are expected to review the entire list this Summer and update priority points.

The intersection meets four operational, volume, and accident warrants for a signal. Coordination with other signals is one of the operational warrants which can justify a traffic signal, and the Department of Public Works project to synchronize traffic signals at Fallbrook intersections could allow the new signal to be timed in conjunction with nearby signals.

In the 56-month period from January 1, 2005, to August 31, 2009, 18 collisions were reported at the intersection. The accident rate of 0.39 per million vehicles slightly exceeds the statewide average of 0.34 per million vehicles for similar suburban intersections.

That part of Mission Road has two travel lanes in each direction, left-turn pockets for both directions, and edge striping along both sides of the roadway. The street is approximately 81 feet wide and is classified as a major road in the county’s Circulation Element. The 35 mph speed limit is certified for radar enforcement.

Aviation Road is a striped two-lane roadway with stop controls at the intersection with Mission Road. It is approximately 43 feet wide west of the intersection and 29 feet wide east of the intersection. Aviation Road does not have a posted speed limit and is not classified on the Circulation Element map.

An October 2009 traffic survey at the intersection revealed an average daily traffic volume of 12,970 southbound vehicles on Mission Road north of Aviation Road, 11,260 northbound vehicles on Mission Road south of Aviation Road, 1,780 eastbound vehicles on Aviation Road west of Mission Road, and 870 westbound vehicles on Aviation Road east of Mission Road. The previous traffic survey at that intersection was conducted in November 1995 and determined an average daily traffic volume of 12,260 southbound, 13,950 northbound, 840 eastbound, and 860 westbound vehicles.

Although a signal at Aviation Road would add a traffic light between those at Ammunition Road and at Fallbrook Street, the new light could be timed to be coordinated with other signals.

While the TAC unanimously voted to place the intersection on the Traffic Signal Priority List, it also recommended signage for Aviation Road, which notifies motorists that Mission Road traffic has the right of way.

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