That's a great illustration of why limited regulation can be desirable: if the law says you must apply brakes, it bans downshifting for engine braking (a better

That's a great illustration of why limited regulation can be desirable: if the law says you must apply brakes, it bans downshifting for engine braking (a better means to slow, arguably)! Regulation ossifies a "state" of the world and it may be inaccurate, or it may become outdated compared to the needs of the future.