Andy in Sig said:Now think about this ... the commentary only applies at places where you have to make a decision: go right or left or under a tunnel or something. So when people come to a place like that, they switch on their mp3 player, or if they're being more clever they listen to the next checkpoint in advance. The only other thing is that the descriptions of the points have to be clear enough so that no-one could mistake one for another.
nah, they won't be arsed to keep switching it on and off at every junction. What about in towns and villages where there's quite a high frequency of junctions but still quite a variation in the time people will take to get through it due to traffic etc?