Definition of lane discipline in US English:

lane discipline

noun

British
  • Orderly and considerate driving by road users when changing lanes or overtaking other vehicles.

    ‘police have the power to pull over motorists for poor lane discipline’
    • ‘Drivers should realise that a bit of lane discipline would be a huge help to the traffic flow.’
    • ‘Those who need to travel are encouraged to carpool, use public transport, or maintain lane discipline in their own vehicles.’
    • ‘I was cut up this morning by some idiot who didn't understand lane discipline.’
    • ‘The board carries illustrated guidelines on lane discipline, warning about the fines for violations.’
    • ‘Many just potter along and don't know lane discipline at roundabouts.’