Most now-developed passenger vehicles with gasoline or diesel engines use transmissions with four–ten forward equipment ratios (also referred to as speeds) and just one reverse gear ratio. Electrical cars commonly use a fixed-gear or two-velocity transmission with no reverse gear ratio. Automated gearboxes appeared commercially in the 1940s, based on https://cvt-toyota85172.sharebyblog.com/33751005/about-automobile-gearbox