Because going the speed limit is unsafe in certain scenarios, because other human drivers are expecting people to exceed the limit like they do.
It's the same with Tesla wanting to allow rolling stops at stop signs – not the letter of the law, but it's what humans expect. In many instances you are more likely to cause a minor accident (being rear-ended) by coming to a complete stop at a stop sign than the risk of causing and accident by rolling through an intersection that clearly has nobody else in it.
Won't be a problem once most cars on the road are driverless.
It's the same with Tesla wanting to allow rolling stops at stop signs – not the letter of the law, but it's what humans expect. In many instances you are more likely to cause a minor accident (being rear-ended) by coming to a complete stop at a stop sign than the risk of causing and accident by rolling through an intersection that clearly has nobody else in it.
Won't be a problem once most cars on the road are driverless.