Well consumer cars do not have 5 point harnesses, and most cars don't even have roll cage or roll resistant frame. We use a 3 point seat belt out of convenience

Well consumer cars do not have 5 point harnesses, and most cars don't even have roll cage or roll resistant frame. We use a 3 point seat belt out of convenience, and we let people drive on freeways with said cars. Also don't install a 5 point harness without a proper roll cage you will be asking for trouble.