Again, why are you singling out semi-autonomous mode? Isnt it even MORE important that the driver is paying attention when he is driving manually? And yet these regulations disable the attention system when they are manually driving.
The assumption you seem to be making (and is implied by the regulations) is the car is more dangerous when lane keep systems are on. What evidence do you have for this? If none, on what do you base the assertion that semi-autonomous modes require monitoring when manual modes do not?
Because the driver is less likely to pay attention with a semi-autonomous system than driving manually.
In manual driving, you have every incentive to pay attention since the car cannot drive you when you are not paying attention. But in semi-autonomous mode, you have less incentive to pay attention because the car can still "drive" you when you are not paying attention. In fact, you can go miles with the car driving for you and you did not have to do anything. It can lull you into a false sense of security. So yes, it is potentially more dangerous, because you will pay less attention with semi-autonomous driving that lacks a reliable driver monitoring system than if you were driving manually.
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