In Speed Circuit, each player takes control of a Formula 1 racecar zipping around the tracks. Each person then distributes a number of points to Start Speed, Top Speed, Wear and other attributes, five points per lap. Then, each player moves based on their speed, and can adjust their speed, choosing to forfeit a Wear Point, or roll the Chance Die, where a bad roll could cause you to move through, spin out, or even crash out of the race. Whoever gets over the line first wins.
Before the race begins the players prepare their cars by allocating points, so if you want faster acceleration or speed you have to sacrifice start speed or braking or tire wear.
Each turn, the players write their planned speed for the next turn and then move their cars 1 space per 20 mph. Each curve on the track has a speed limit that cannot be exceeded without penalty. If you exceed curve speed, overaccelerate or overdecelerate your car, etc., you pay penalties in tire wear or possible damage to your car or elimination from the race.
The original 3M Sports Games version used speedometer wheels to select speed, used a random card draw to determine the car characteristics and has no random elements.
Ghost Drivers is a system for adding drivers to a race that will drive themselves. You could race by your self against a field of Ghost Drivers or add some Ghost Drivers to a field of humans to fill out the field.
This is my take on the Zandvoort circuit which hosted the Dutch GP from 1958-1971. I used Eddy Bee's track templates.
A change was made to the Panorama curve in 1973, which is reflected in the official AH version of the track found in Accessory Pack 1. http://boardgamegeek.com/image/79180/speed-circuit-accessory-pack-1
I used three primary sources in addition to AH's version to construct the circuit:
http://www.statsf1.com/en/circuit-zandvoort.aspx (for the shape and length)
http://www.circuitsofthepast.nl/en-US/zandvoort (for info about the corners and character of the circuit)
http://wiki.grandprixlegends.info/index.php?title=LOR_Trackguide_Zandvoort (for corner speeds)
Playability comments are welcome.