Wiper Dilemma

Greg and JL just left the house for some 'man time'.  It is raining so they will probably drive around, sing, and wait for the rain to pass.  Its JLs snack time so he'll be set in the back seat for a while and will just enjoy the ride.  Greg got stuck in traffic and noticed this lady in front of him in quite a pickle.  At every stop light, she was jutting her head out of with window, with a windshield wiper in her hand, wiping her windshield on the drivers side!