Final answer:
The consequence of operating a construction vehicle at speeds exceeding 45 mph is an increased risk of accidents due to decreased vehicle control, longer braking distances, and potential mechanical failures.
Step-by-step explanation:
The consequence of operating a construction vehicle in excess of 45 mph is increased risk of accidents. When vehicles, especially large ones like construction vehicles, are driven faster than their intended operating speeds, the ability to control them decreases, and they become more prone to losing stability or experiencing mechanical failures. This results in a higher probability of accidents occurring due to the reduced reaction time for the driver and the increased braking distance required to stop the vehicle safely.
Speed limits are set not only based on what is legally allowed, but also on safety considerations. Exceeding the speed limit can result in traffic violations and tickets. Moreover, operating vehicles at higher speeds can lead to greater fuel consumption, contrary to the notion of improved fuel efficiency, much like the way conventional cars are becoming more fuel efficient to achieve more miles to the gallon. Also, the statement that higher speeds reduce wear and tear on the vehicle is incorrect; it's actually the opposite, as higher speeds can lead to increased wear and tear on various components of the vehicle.