The cap is legally mandated, for safety reasons. They are not regulated for safety in high speed crashes. <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Low-speed_vehicle" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Low-speed_vehicle</a>