I would raise one issue that I don't see addressed in the wiki and is applicable to all ramps with splits at the end. If there is a sharp turn at the end of the ramp to the road you should get a "turn" instruction. If there is a slight turn at the end of ramp to the road you get no instruction. Thus, if exiting I-97 here if turning left on Quarterfield Rd, you get an instruction to "Exit right at Exit 13: MD-174 Quarterfield Rd," an instruction to "stay left to MD-174 W Severna" (if exiting from I-97 N) and an instruction to "turn left at Quarterfield Rd." If you are turning right on Quarterfield Rd, you only get the exit instruction and the stay instruction: you get no "turn right at Quarterfield Rd" instruction.
I'm not sure whether you want both stay and turn at W Waters road instructions. But the basic problem is that the angles are so close to 45 degrees that I'm not sure whether you will get the turn instructions or not at the end of the ramps.