Vectors: RaceTrack Explanation

About Racetrack, from BoardGameGeek:

Racetrack is a paper and pencil game of unknown origins which simulates a car race in an abstract manner. Racetrack is played on a sheet of square graph paper on which a track is drawn. Each turn a player draws the movement vector for his or her car - it can differ from the previous move's vector by only a certain amount (e.g., 2 squares total). A fair amount of planning is therefore necessary in order to negotiate curves safely. The game has inspired many others, including: Motor Speed Tacara Bolide Triplanetary Breakneck Blitz Generic Racing Game VektoRace Grid Race