Students find it difficult to park on campus. Freshmen aren't allowed parking permits for campus lots, and street space around Troy is scarce. Those who live off campus and commute say that you need to allow a lot of extra time for finding parking. The few student-accessible lots are small, with the exception of the Field House lots-and from these, you have to take a bus to main campus.
If you're a freshman, don't bring a car. The University technically doesn't allow you to, anyway, and it's just not worth the hassle. Upperclassmen can get campus parking permits, but keep in mind that RPI oversells these, so there are no guaranteed spots. If you live off campus as an upperclassman, try to find a place within walking distance-commuter parking is absolutely horrid. And if you do bring a car, be forewarned: Troy has hills like Rome and stoplights on every corner; it can cut your car's gas mileage in half.