Delayed bump for this topic.
About 15 years ago I was really into 1/43 and acquired several of the 4 lane Childford Formula 1 sets, building a portable rolling 4'x12' oval layout I transported in a 6'x12' enclosed motorcycle trailer w/ramp. I bought a lot of NASCAR cars from Frank at SCW for this track. I took the track to car shows, school carnivals, and kid's birthday parties. It was a hit.
It came equipped with electronic lap counters for each lane. For the younger kids, I equipped the cars with guide pins that made it difficult for the cars to deslot.
The rules were simple: 2 minutes per race, maximum laps completed wins. Your car deslots, you were out of the race; no track calls; no marshalls. Lane choice was determined by roll of a die, with #s 5 and 6 wild cards; your choice of any lane.
Fast forward a couple of years, more folks wanted to race at the same time at birthday parties, so I recalled my old Eldon Selectronic set, and rewired the Childford track, cars, and controllers to AC2CAR to allow 2 cars per lane, but no lane change, with an old Lionel AC train transformer.
This time each lane had a team of two cars; The team with the most laps in two minutes wins.
I am now working on adapting this same team racing game play to a portable two lane 1/32 Artin track, wired for AC2CAR, but no lane change, but with an additional electrical circuit per lane to allow a team of up to 4 drivers per slot. Looking to put together a diy lap counter; no timing for simplicity.
While I believe that two slots and 8 drivers to be the maximum for enjoyable racing fun, it's quite possible to increase the number of lanes and cars.