Zach from Denver writes, “What’s driving you crazy? Does CDOT actually utilize these variable speed limit signs I see all over I-70 in the mountains? When I see them they are usually stuck on "55" or "test" and some of them have broken screens that just display color bars. They just seem wildly inconsistent and unclear.”

Welcome to the future, Zach, where life is going electronic.

The Colorado Department of Transportation (CDOT) has installed 65 of these variable speed limit signs (VSLs) west of Denver. These LED electronic versions of the more traditional speed limit signs are set up along much of Interstate 70 between Golden and Glenwood Springs. Unlike the typical static signs, these digital signs display enforceable speed limits in real time, based on current highway conditions. The

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