Q: In a construction zone with a speed limit of say 35 mph, where the speed limit is normally 55, once through the construction when does the speed limit change back to 55? Is it at the “end road work” sign, or not until you see the next 55 mph sign, which could be miles away?
A: Somebody just read the last part of this question and thought, “come on, miles away? You’re just being dramatic.” Not necessarily. The Washington Department of Transportation (WSDOT) Traffic Manual specifies where speed limit signs should be prominently located “for maximum awareness.” It includes the places you’d expect: when the speed limit changes, at major interchanges or intersections, and at state and city limits. Oh yeah, there’s one more on the list. In rural areas, speed limit signs are spaced at 10-to-20-mile intervals (for maximum awareness.) No, that’s not a burn on WSDOT. There’s a science to proper sign placement, and they know what they’re doing.
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