maryland route 589 (md 589) is a state highway in the u.s. state of maryland. known as racetrack road, the state highway runs from u.s. route 50 (us 50) at grays corner north to us 113 and md 575 in showell. md 589 provides access to the planned community of ocean pines and ocean downs, a harness racing venue with a casino. the first portion of the state highway was constructed through showell in 1935. md 589 was completed to us 50 in 1949 and 1950.