Does anyone have a link to vicroads that describe the 45 degree rule, or able to tell me how to measure it? I got done today on my CBR250rr which is an absolute pain in the arse because if you can even find another undertail thing they have virtually all been cut down. I'm thinking I'll just rivet a piece of plastic to the back to pass the vicroads test. Just need to know the rules so I know how to make it. Something like http://www.vicroads.vic.gov.au/NR/rdonlyres/7A14DDDC-3DF3-4ADD-9821-B8C7816777A3/0/VSI26web.pdf for bikes would be ideal.