someone explain a couple of road sighns

[FlyingDutchMan]

I found out unintentionally how fast you can take a 65 corner. I'd overtaken a cage and noticed that there was a long 65 corner right in front of me. No time for the brakes - had no choice but to tip in and hope the wheels would stay stuck to the road. Throttled off all the way round the corner - and had a look at my speedo after it - only doing 130 on exit. Put the biggest grin on face . Didn't go below 100 after that except for 25 and 35 corners.

I've got a mate who works for the CHCH council as a roading engineer. For testing the corner speed they have a little device which sits on the dash that has a 1/2 circle track mounted with the open ends up. A ball bearing sits in the track and has to stay within a certain distance from the middle. So of course they test the corner from the fastest speed they dare and then eventually by going slower and slower they get the right speed.

[Rainbow Wizard]

For testing the corner speed they have a little 1/2 circle track mounted with the open ends up. A ball bearing sits in the track and has to stay within a certain distance from the middle. So of course they test the corner from the fastest speed they dare and then eventually by going slower and slower they get the right speed.

Must be the origin of the term "cornering, balls out"