How do you make object drivable?

Like the title says,i have manged to import and 99% texture my map,but of course the map is a static object or whatever,so now how can i make it drivable cause i get this:



i can drive rite trough the hole thing not actually on it.any advice?

 

Try setting the "Collision Mesh" to "Visible Mesh" in the properties window

 

Thank you for the reply,i seen that option before.do not remember were,i am looking here


and here



i am confused,i know i seen that option some where.

 

tis here. not there

 

Holy crap,thank you both i got it,this track is just a beta that will never be completed but its still fun to finally drift on it,just like when i am there in real life with my car,i will release this soon to all of you to mess around with.now that i know the hole process is time to start work on the real project i wanted to work on.