I don't think trains are the same as cars. Trains are supposed to run at high speeds under normal circumstances and the system is supposed to keep everyone safe. It clearly said they wouldn't be able to drive over 40 km/h if they had to operate by line of sight.
Cars otoh don't have someone overseeing everything and directing traffic. They have to operate by sight.
Cars otoh don't have someone overseeing everything and directing traffic. They have to operate by sight.