I've got a 6 inch crack in my windscreen right in my field of view from a middle lane Hogg on the M6 yesterday

Can anyone offer any advice - the manufacturers "etching" on the passenger side says ... "LAMIPANE GGN DOT 23 NIPPON SAFETY AS1 NSG M411". A quick google hasn't turned anything up.
I wondered if the GGN might suggest green (blue ?).
Cheers
Jim