Howard, I see no problem when cars stick to the speed limit.
I got trad. Mogs to drive slow and feel fast.
Without goggles you will hardly excess the legal speed limit in a M3W .
But there is sticking to the speed limit and sticking to the speed limit. I dont normally break the limits and have had a clean licence for at least 20 year. But that doesnt mean that my car never drifts up to 32 mph in a 30 limit or 75mph in a 70 limit. Those speeds are within the "tolerance" and in any case who can watch the speedo all the time. Indeed, it wouldnt be safe to do so.
But an autonomous vehicle will have to be programmed never to exceed the limit under any circumstances at all. So whilst I might overtake a car travelling at 27mph and in so doing reach 35 mph, the autonomous car will never overtake. To do so with a 3mph speed difference would be dangerous. In effect you are taking common sense out of the equation and substituting blind obedience.