Driving on a motorway

By the end of this topic you can

• You can list who and what is banned from motorways.
• You can keep to the correct lane and overtake only on the right.
• You can keep a safe following distance at high speed.
• You can say when stopping on a motorway is allowed.
• You can recognise the main motorway signs.

What you need to know and understand

• The motorway speed limit is 120 km/h unless signs show lower, or your vehicle has a lower limit.
• Banned from motorways: learner drivers, cyclists, pedestrians, animals, vehicles of 50cc or less, vehicles unable to reach 50 km/h, and e-scooters.
• No turning, reversing or U-turns, and no picking up or setting down passengers.
• You may stop only for a breakdown, an emergency, roadworks, a toll plaza or if a Garda signals you.
• The hard shoulder is for emergencies only.
• Vehicles towing, goods vehicles over 3,500 kg and buses designed for standing passengers must not use the outside lane except to pass an obstruction.
• Keep at least a two-second gap, and more in bad weather.

Lane discipline

• Left lane: normal driving. Keep left unless overtaking.
• Middle lane of a three-lane motorway: you may stay here while slower traffic is in the left lane.
• Outside lane: for overtaking, then move back in. On a three-lane motorway, use it only when the other lanes are busy and you need to pass.
• Overtake on the right. Passing on the left is allowed only in slow-moving queues where your lane is moving faster.
• Signal before every lane change. Moving across two lanes is two separate manoeuvres.

Space and speed

At 120 km/h you cover more than 30 metres every second. Use the two-second rule, double it in the wet, and look well ahead for brake lights. If traffic ahead slows sharply, a brief burst of hazard lights warns drivers behind. Drive within the limit and also at a speed that suits the traffic and weather; very slow driving that holds up others is also unsafe.

Signs and stopping

The Motorway ahead sign lists who must not enter. Overhead electronic signs may show lower limits or lane closures. A red X over a lane means do not drive in it.

Plan rest breaks at service areas. Tiredness is a major risk on long, monotonous motorway drives. If you feel sleepy, leave at the next exit or service area; do not stop on the hard shoulder to rest.

Common mistakes

• Staying in the middle or outside lane when the left lane is free.
• Tailgating at high speed.
• Undertaking in free-flowing traffic.
• Stopping on the hard shoulder to take a call or check directions.
• Driving while tired instead of taking a break.

Test yourself: Driving on a motorway

Answer each question, then read the explanation. Questions come in a random order each time.

Go deeper

• Speed Limits in Ireland 2026