Typically because a vehicle like a Mercedes has passive restraints like
airbags, while the dumptruck usually does not, but would be irrelevant
in any case because you typically don't see a dumptruck driver wearing a
seatbelt.
-- TANSTAAFL!!! Michael Lorrey ------------------------------------------------------------ mailto:retroman@together.net Inventor of the Lorrey Drive MikeySoft: Graphic Design/Animation/Publishing/Engineering ------------------------------------------------------------ How many fnords did you see before breakfast today?