Not a "proceed" command but they can influence the accelerator. I had a dodge ram van that would constantly decelerate on cruise control due to reading road signs. The signs in some states like California for trucks towing trailers are 55 mph but the speed limit would be 65 or 70 mph. The cruise control would detect the sign and suddenly decelerate to 55.

That's an example of things working as expected - the sign recognition system is very limited, in that it can only return road sign information. So it can _ask_ cruise control system to change the speed, but it's up to cruise control to decide if it's safe to obey the request or not. For example, I am pretty sure it'll never raise the speed, no mater what sign recognition system says.