Board Thread:Game Discussion/@comment-26388545-20170610000204/@comment-29898480-20170610110147

The red & white barriers at HK are "bouncy" and allow significant contact before invalidating the lap. In real life this would be a SAFER barrier or similar. In addition, you can scrape conventional "hard" walls - the ones that are concrete in real life.

After some practice you can combine these two tricks in the first hairpin at HK. I was surprised how hard you can hit that red & white barrier laterally and not invalidate.

"Wall-riding" is a little different. It involves hitting the curved outside barrier of a turn just right so that you slide around the outside of the turn, along the barrier, while on throttle. Apparently you can make it work for speed in the second hairpin at HK, but it's not a skill I've learned. As noted above, the carousel at Porsche Test Track, and the right hand turn into the uphill at Mt Panorama are other turns that reward wall-riding.