The thing is the customer opted to take a discount in exchange for an artificial limit. They have been doing this in microprocessors for decades! If you buy a new laptop and it offers you a faster processor speed for more money, you are getting a chip that was on the same die was the cheaper one.

Yes it uses the cameras and will show the speed limit on the dash, the driver ,like in any car can set speed at what ever they want. You can also set the distance to follow someone. A lot of people drive 9 miles over the limit because in most places you won’t get a ticket for it.