Usually these are numerals only, but I've seen some alphanumerals a few times in the past, and the after action report I'm reading now has 4 alphanumeral instances.
Is there a particular reason for letters on number plates?
There are a couple of special numbers, traditionally the letter T was used by spare cars in a team, usually with the teams main driver number following it - so an F1 example would be T1 for Renault's spare care (a bad omen in LFS terms!). This isn't really done in F1 any more because wings are so easily changed.
SC is for safety car.
GP is for the winner of the same event during the previous season.
0 and 00 are used by champions of OTHER race series.
1 is used by the reigning champion of the current series.
I can't think of any others off the top of my head.
(Note: The LFS league STCC that i'm involved in allows all of these special numbers except T which isn't appropriate.)
While talking about the numbers... Is it possible to retrieve your license identification number from LFSW somehow? If it was possible I'd go and put this number as my start-number on every of my skins right now. (Because it's the only start number that uniquely identifies me.)
click on your username here next to your post and hover over any of the appearing links. Look in the status bar of your window to see the urls of the links - they contain your user id (71701).
MSA regs a basically max 3 digits for speed events (sprints, hillclimbs, rallies) and max 2 digits for race events. The number 13 is also not normally issued unless a driver asks for it.
The MSA regs apply in the UK only and I forgot to mention exceptions can occur in races with large grids. If you look in this months Motorsport Now (MSAs free mag for license holders) there's a snipet on it somewhere.
Those c & w numbers are going to be specific to the regulations that series is run under, I would imagine the "c" is for cadet, which could indicate a single engined kart or perhaps a rookie, and "w" you can figure out for yourself - the drivers must have upset the girl who takes the bookings.
I dont believe so, tbh i've not seen a GP plate for a good few years now but that's probably because I havn't watched as much club/national racing as I used too. I dont think it would apply to club racing anyway, so it wouldnt really be a kart thing as most kart championships are club level.
One thing you do see in karts a lot is different colour codes for the numbers, the background and the colour of the number itself all mean different things and can be used to identify both the class of the kart, and whether the driver is a rookie.