Between Nampa and Boise, the speed limit is 65 miles per hour-- but is anybody actually going that speed? The Idaho State Police wrote:It’s no secret the Idaho Transportation Department has construction projects going on statewide. During the emphasis, a trooper observed a GMC Yukon traveling 100 mph in a posted 55 mph construction zone. We want to remind all drivers to slow down in construction zones. That fast at ay point is insane--but in a construction zone?