This was a first sighting for me – a lifeguard vehicle.
Photo courtesy of Kevin Connors. And another by Kevin:

Rescue vehicles during an evening rush hour accident – photo taken by Kenn Kiser. Here are three more vehicle shots Kenn took.

Sierra Ambulance courtesy of Michael J. Summerville.
It’s not just US ambulances that use the trick of backwards writing so that drivers see the correct word in their rear view mirror. This picture was taken by Clara Natoli of Rome, Italy. Here’s another emergency vehicle courtesy of Clara.
This photo by Mary Thorman of Costa Rica was labeled “First Modern Ambulance.”
Antique ambulance photo by redgate.
Military ambulance taken by Kathy Bishop.
Old war ambulance parked outside of the Air Transport Command in Delaware – photo courtesy of Emily Roesly.
Ambulance in Harajuku, Japan – thanks again to Daniel T. Yara.(All photos are from http://www.morguefile.com/)