midnight motorway noises

I'm leaving for San Francisco tomorrow where I'm sure the motorway noises will sound awful different... Maybe they'll ask me to have a nice day, or say "pants" where I usually wouldn't. They'll whizz past me I think, a slowly gathering gale that will whip me up soon enough so that I'm among them, battering along above the city, looking with baffled amazement at the folk below.

Marvellous new noises, but none quite so fine as home.