A: They don't know the route.
If she's only wearing one sock. (This joke brought to you courtesy the homeless guy outside my local 7-11.) Edit: tweaked the punchline.
Oh you know, it has its prose and cons. Badum Tish. Be gentle, first time here.
For throwing out all the w's.
A: Because red means stop.
Recalculating route.
He's on route.
A: Cos they've no idea of the route.