Dwight is right, varies depending on local standards, car sizes and building layout or lot configuration - potentially a 'Big Topic'. One source of information is the "Architectural Graphic Standards" in the USA, Europe has it's own version; "..Manual of Architectural Design.." - Ernsy Neufart. Here I'm dating myself.
For a quick reference use the web search, or:
http://www.webs1.uidaho.edu/niatt_labmanual/Chapters/parkinglotdesign/theoryandconcepts/ParkingStall...
- Hope this helps.
jacek lisiewicz
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