In general, it is better to head for the right shoulder of a limited-access roadway, since it is usually wider, away from the fastest traffic and more accessible for anyone who comes to help. If there are emergency phones, they are usually on the right shoulder. And if you need to walk for help, you can do so. If there is heavy traffic, however, don't try to cross from the left shoulder to the right one. Wait for help. Of course, if there is an exit handy, try for it. If you have lanes to cross to get to the shoulder you chose, you must react quickly, pick your gaps in traffic immediately, move aggressively and clearly communicate the urgency of your situation to other drivers.