CALL AHEAD!! I went at around 9pm on a Saturday evening and was told that there was a 2.5hr wait. Needless to say, we didn't stick around. Next time we'll go earlier in the day.
For anyone that races real karts don't be tricked. These things are just about as slow as any other theme park...at least they don't shut em off on you though. Still fun with. Bunch of people.
Experience a thrill like no other! Speed-lovers, be prepared for the newest attraction taking over the Jessup, MD area: European-style indoor go-karting!