Correct answer
No.
No. Contraflow lanes opened for traffic-flow reasons are reserved for motorcycles and passenger cars without trailers, so a lorry may not use them. Lanes opened for roadworks are a different case: they may admit vehicles authorised on the road under works unless expressly prohibited. Applicable conditions must be observed, including dipped headlights by day and night and the 60–80 km/h range or lower speeds when established or signposted.
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Yes, unless expressly prohibited.
No.
Yes, in all cases.
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