The WHPSC is  adopting an additional safety requirement for all vehicles:

"A retention means sufficient to hold the rider in the vehicle during a 360 degree roll is required, commencing at WHPSC 2019."
 

While this is not an official IHPVA rule at this time, it is an additional requirement by the WHPSC.

We will also be encouraging teams to include in their design a roll-bar or similar structure to protect the rider in the event of roll-over.