While I love to jump on the anti-Elon bus, I have to query: the highest accident rates, or highest accident rates as a percentage of vehicles on the road? If you have 10 Tesla cars on the road, and there are 2 MGs on the road, and 2 Telsas and one MG crashes, then what? 20% of Tesla vs. 50% of MG, but also that could be framed as ‘double the number of Teslas crash compared to MGs’ or ‘Tesla has the highest accident rate of any auto brand’.

Ah, thank you. I’ll have a go at that then.

Are you referring to the #define MASTER_LEFT?

This is just defining whether the USB is plugged into the left board or right board.

All defines start with a hash as standard. It’s not commenting the line out. For that, you’d use //.