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Surely they're a long way off being legal on public roads. DH rear ended someone in our EV in January and he reacted before the sensors alerted him. They were no better than him at making allowances for a damp, muddy road. If the situation arose again, even he would remember that he needs way, way more than a 2 second gap (I'm one of those vilified non drivers but considered the highway code essential reading at 6) but the so called intelligent systems in the car won't have learned to account for Co Durham hills and mud running off the fields