A train stalled over a gap in the conductor rail of an electric railway is said to be "gapped". This occurs when the shoes on the train which collect the current have all lost contact with the current rail due to gaps left for junctions. Particularly prevalent at complex junctions such as the entrances to yards. See also conductor rail. A driver who has "gapped" his train will always be the subject of ridicule from his peers. Knowing where the gaps are is part of road learning.