If you can't get a tow truck, you might have to move your car yourself. Once a traffic accident occurs, emergency personnel work to clear the streets of debris as fast as possible.
If your car is involved in a collision and is undrivable, it will most likely be towed to an impound lot. This is just the process that is followed to keep the roads safe for everybody. So, if possible, go and pick up your automobile after the wreck as soon as possible to prevent racking up massive storage fees from the impound lot.