Ice cream vans have got the right idea. You hear 'Greensleeves' and you know there's somebody selling ice cream and drugs outside your house. Other service vehicles should do the same.
Police: Anything by the Police obviously, or Supergrass with Caught By The Fuzz.
Fire engines: Burning Down The House by Talking Heads, or possibly Arthur Brown and Fire.
Rubbish Trucks: Anything by Garbage, or My Old Man's A Dustman.
Over-sized Loads Escorts: Fat Bottomed Girls By Queen.
AIBU?