Motorway lane gain sign
A blue sign with a diagram showing three lanes on the motorway being joined by one lane from the left.
A fourth lane returns from the M25, but it'll dip in and out again at most of the junctions that follow.
A blue sign with a diagram showing three lanes on the motorway being joined by one lane from the left.
A fourth lane returns from the M25, but it'll dip in and out again at most of the junctions that follow.