Why does the station side of the road need two lanes of traffic which double yellow lines, when there is only a single lane both before and after the bridge?

By reducing this road to a single lane of traffic, a slightly wider pavement could be installed outside the station. Not enough for market stalls, but a little wider for pedestrians on a narrow bit of pavement outside an increasingly busy station.

Widening a pavement is not a horribly expensive change if it is considered a useful change.