We have mixed age groups in the BPCC which sometimes cause problems but most of the time is just another factor of racing which you deal with. Over the last couple of years, driving standards have improved to a point where this is less of an issue than it was.
The golden rule we have is that it is up to the faster machine to make the pass cleanly and safely, not to expect the slower machines to move off their line. But this is backed up by the expectation that the younger or slower drivers stick to their lines and do not weave or wander. These were not rules we thought of ourselves, they are exactly the same as those which apply in most forms of racing where there are different classes of machinery on the same track at the same time.
Generally it works out and the time lost in traffic balances itself out over the course of a race. Occasionally, of course, tempers get frayed but the smart teams realise that it works itself out.
Obviously we are talking about smaller circuits where the race controller can see a lot more of it.
I know we're talking about slower speeds all round but we are probably taking about similar differentials in momentum and it's momentum which hurts.
When we raced on the full Castle Combe circuit last year the kids didn't mind too much. They didn't find it that exciting in pedal cars but they didn't mind the distance.