Originally posted by BlueSharp
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The status or speed of the traffic being undertaken is irrelevant. However, the onus and responsibility for completing the undertaking manoeuvre safely lies with the person performing the undertaking maneuverer.
Smart motorways do generally work in high traffic density situations as they bring all the traffic down to the speed of the lowest common denominator, i.e. articulated lorries, and therefore there should be no reason for anyone to change lanes, except when entering or leaving the motorway. Where the problems do occur is down to lack of forward planning by drivers who wait until the last possible moment to get into the correct lane to leave the motorway, causing either themselves to brake (having a knock-on effect) or the traffic lanes they are trying to enter to brake (having a knock-on effect). Simple planning, forward thinking, and an acknowledgement of the rule Mirror, Signal, maneuverer IF SAFE TO DO SO, would go a long way on UKJ motorways.
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