A Drag strip is generally where Dragsters (Top Fuel) run (ie Santa Pod) but also put on RWYB (Run What You Brung) days for the general public and have official regulations with regards to the timing, distance, gradient etc.. But you do get 1/4 mile strips set up at Shows etc (like at Bruntingthorpe) and aren't generally seen as being as accurate in some cases, apart from comparing with people running on the same day/event..