Flagstaff transportation commissioners back adding speed humps to neighborhood toolbox

Flagstaff transportation staff asked the Transportation Commission on Thursday to add speed humps to the city's traffic-calming toolbox, and commissioners signaled support for including the devices in the Residential Traffic Management Guide and for lowering the speed-thresholds needed to qualify a neighborhood for traffic calming.

The proposal, presented by Sydney Juve, Transportation Engineer Associate, would allow speed humps on local streets, permit speed cushions on minor collectors and commercial local roads to reduce emergency-response impacts, and recommend a minimum of two devices spaced roughly 250'600 feet apart with modification for long blocks. Juve said speed humps typically reduce speeds by 5 to 13 miles per hour, cost about $7,500 per hump, are 3'4 inches high and about 12'14 feet long in the direction of travel, and that the city's existing…