Their car will do it for them, keeping an electronic eye on the road and giving a constant update on the legal limit.
The job is done by a new computerised control system — linking a forward-facing camera to sophisticated software that recognises traditional and electronic speed signs — that flashes the current limit to the dashboard and heads-up display.
It is fitted first to the new 7 but is expected to move quickly to other models in the BMW family.
Unlike satnav-based systems, the BMW design is not pre-programmed and can react to variable-limit signs and time-sensitive limits such as those in school zones. BMW has no plans to link it to a speed limiter.
