Coming off the bridge, bear right and follow signs for Charlestown/Rutherford Avenue.. At the traffic light, take a left turn into the far right lane onto New Rutherford Avenue that will bring you to Austin Street.ollow I-90 East to Exit 18 (Allston-Cambridge). After toll plaza, follow ramp directions to Cambridge.. At the traffic light, go straight across the intersection and across the bridge over the Charles River. At the end of the bridge, take a right at traffic lights onto Memorial Drive.