I'll repeat what I said last year. Just put reservable 1 meter wide plating on the outside of the first kerb. One side is tarmac or tarmac equal friction coefficient so the bikes have their safe track limit. The other side is a very low friction coefficient sort of astroturf surface. If you go on it, you will definitely lose time.
You flip the plates depending on if you have a bike or car race. No need to store them anywhere, no need for an optical track limit system with penalties. If you go outside the wide line the track will punish you automatically.
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