Emergency vehicles don't and can't expect full compliance and open road 6 seconds after they turn on their lights and sirens, that would be irrational. It takes

Emergency vehicles don't and can't expect full compliance and open road 6 seconds after they turn on their lights and sirens, that would be irrational. It takes time to move out of the way, especially in the sort of traffic this is designed for (low-speed stop-and-go highways).