I don't imagine they are, but when did taxi drivers worry about speed limits? - (any more than the majority of the population)
Had a local taxi firm take and then later collect us when going on holiday.
Collection driver drove ay 25mph even down the main road, wandering about like a drunk (we got there OK though!)
On the way back the driver (same company) ignored all speed limits, and charged a few quid more into the bargain :smileyfrustrated: