There are several higher-end driving simulators that had been created both for research and for tradeshows. Please send an email to
support@worldviz.com and describe the scenario you need.
If you need just a simple driving scenario, you can download the free demo collection "Vision Science Demos"
under Demos Download
http://www.worldviz.com/download/index.php?id=19
It contains a simple simulator world called drive_sim.