i dont think the second system is viable due to the fact that the possibilities for different routes, and different speed limits etc. would create to many possibilities. i know its not a long journey, but there are 3 or 4 fairly direct ways i could drive to college, but they all take different amounts of time due to different speed limits. also as someone else pointed out the fact that it would cross throughout the coverage of potentially a few different police forces (as even my short journey to college does, Surrey Police into a MET Police area) the connection and logistics of it all would become more complicated than nessecery. tbh though, the only time i speed is on motorways, and this is by 10mph, as my car always sat better at 80mph than 70mph. if they raised the motorway limit by 10mph as so many people want, i would have no reason to speed.