Jackin he was asking if there would be Vehicles in CS:S not HL2's Engine(Which technically makes no sense..).
He said that he new there are in HL2.
No there are not vehicles in Cs:S, though they may eventually be added.
No, what it shows is that you have never made a map before. He said driveable things. The buggy WILL NOT be in cs:s.
However, within the hammer editor I could make something driveable for CS within a map
Looks like you need to take a few english lessons; considering you haven't learned how to read yet.