I used space to help show movement in this photo.  I have space in front of the vehicle so that there is room in the photo for it to travel.  I used a technique called panning in attempt to capture the movement.

For the perfect panning photo, use a shutter speed between 1/30 and 1/125s.  The faster the subject is moving, the higher your shutter speed needs to be.  Focus on your moving subject and pan your camera from side to side in tandem with the object as it moves through the frame.  This will cause blur in the background giving the illusion of movement.

Panning is a lot of fun, give it shot!