Has this been planned long in advance? Or is he taking over from one of his cousins (Andrew more likely than Harry I'd say although 'road safety' is not necessarily a theme I associate with either one of them) who would normally have taken this one on? Because in the latter case we might be seeing some redistribution and sharing of workload.
Prince Michael is patron or president of the Royal Automobile Club and Motorsport UK which may explain this visit. Interesting if it is an "official visit by a member of the RF" as usually Prince Michael is only very very rarely considered undertaking official duties.
It wasn't an official visit - as it wasn't mentioned in the CC.
I have it listed as an unofficial engagement (including the fact he did the event with a 'foreign Head of State) in my spreadsheet as I did with Beatrice and her meetings with the President and Prime Minister of Pakistan.