The series of electric control devices developed in 70s for overhead travelling and gantry cranes has several shortcomings.

70年代我国统一设计的桥式、门式起重机系列电控设备存在不少缺点。

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Warwick Crown Court was told Mr Booth was travelling at 55mph despite gantry signs displaying a 40mph limit.

BBC: Priyanka Bhogal

The jury heard Booth was travelling at 55mph, despite gantry signs displaying a 40mph limit, and ploughed into slow-moving traffic.

BBC: Priyanka Bhogal

The court had heard Booth was travelling at 55mph, despite gantry signs displaying a 40mph limit, and ploughed into slow-moving traffic.

BBC: Priyanka Bhogal