[Storm]

Pulling as in trying to get away? If so patience and feeling, rewarding favourable behavior and even trying to form a pleasant association with the sound or presence of cars. Don't force the issue and work from a distance if possible slowly giving the dog a chance to "climatise". Also don't reinforce fearful behavior by consoling her. Slowly working closer to the "distraction" with your attitude been "silly cars" nothing to be bothered about!