ISM Road Rules and Driving Theory Guide
Rules for Overtaking and Lane Positioning
Overtaking on the Left: This maneuver is permitted only in specific circumstances:
When the vehicle in front of you has signaled their intention to turn right and you have enough room to pass on the left safely.
When you are in a line of traffic that is moving faster than the line of traffic to your right (e.g., in heavy, slow-moving traffic).
When you are on a one-way street where traffic may occupy both sides of the roadway.
When you intend to turn left and have signaled accordingly.
Prohibited Overtaking Scenarios: Overtaking is strictly forbidden in the following situations:
At junctions or as you approach a junction.
On a bend in the road where visibility is restricted.
At the brow of a hill.
On a humpback bridge.
Where there is a continuous white line in the center of the road.
At pedestrian crossings.
Where your action would cause another vehicle to slow down, swerve, or stop.
Road Markings for Positioning:
Broken White Line: This marks the center of the road. You may cross it if it is safe to do so.
Continuous White Line: You may not cross this line except to avoid an obstruction, to enter or leave a property, or if there is a broken white line on your side of the continuous line.
Double White Lines (One Continuous, One Broken): You must obey the line that is closest to your side of the road.
Two Sets of Broken White Lines: These indicate that you are approaching a continuous white line, signaling a hazard or a restriction ahead.
White Horizontal Lines (Hatched Markings): These are used to separate traffic or protect traffic turning right. You should not enter these areas unless it is an emergency.
Junctions and Right of Way
Uncontrolled Junctions of Equal Importance: In these scenarios, you must give way to traffic approaching from the right.
Right of Way Principles: At any uncontrolled junction, traffic already on a main road has the right of way over traffic entering from a minor road.
Turning Right on a One-Way Street: When preparing for a right turn on a one-way street, you should position your vehicle on the extreme right-hand side of the road.
Turning Right on a Main Road: The procedure involves:
Checking mirrors and signaling well in advance.
Moving towards the center of the road (just to the left of the center line).
Yielding to oncoming traffic.
Completing the turn when a safe gap in traffic occurs.
Stop Signs: If you encounter a stop sign with no white stop line on the road, you are legally required to stop at the sign itself before proceeding.
Junction Boxes (Yellow Box Markings): You must not enter a junction box unless your exit is clear. The only exception is when you are turning right and are prevented from completing the turn by oncoming traffic or other vehicles waiting to turn right, provided you are not obstructing other traffic.
Traffic Signals and Pedestrian Crossings
Traffic Light Sequence: The standard sequence for traffic lights involves:
Green: Proceed if the way is clear and it is safe to do so.
Amber: Stop unless you are already so close to the junction or stop line that it would be unsafe to stop.
Red: Stop behind the line and do not proceed.
Zebra Crossings at Night: These are identified by flashing amber beacons, known as Belisha beacons, located on both sides of the crossing.
Pedestrian Crossing Island: If a pedestrian crossing has an island in the center, the law treats each side of the island as a separate and independent crossing.
Speed Limits and Vehicle Maintenance
Speed Limits:
The speed limit on a National Primary Road is .
The speed limit on a motorway is .
Tyre Safety: The minimum legal tread depth for vehicle tyres is .
The Two-Second Rule: This is a technique used to maintain a safe following distance. In dry conditions, you should stay at least behind the vehicle in front of you. To measure this, pick a stationary object; after the car ahead passes it, you should be able to count "one thousand and one, one thousand and two" before you reach the same object. If the weather is wet or icy, this gap should be doubled.
Parking and Stopping
Legal Parking Distance: A vehicle must be parked within of the kerb.
Proximity to Junctions: You are prohibited from parking within of a junction.
Prohibited Parking Areas: You must not park in the following locations:
Opposite a continuous white line.
On a clearway.
At a bus stop or taxi rank.
On a footpath or cycle track.
Near the brow of a hill or on a bend.
Blocking an entrance to a property.
At a pedestrian crossing or within the zigzag lines.
Road Markings for Parking:
Clearway: An area where no stopping or parking is allowed during the specific times shown on the clearway sign, except for buses and taxis picking up or dropping off passengers.
Broken Yellow Line: Used to mark the edge of the roadway (the hard shoulder).
Single Yellow Line: Indicates that parking is restricted during certain hours; motorists must check the nearby signage for exact times.
Safety and Authority
Dazzling Lights: If you are dazzled by the headlights of an oncoming vehicle, you should slow down or stop if necessary. Keep your eyes focused on the left-hand verge or kerb until the vehicle has passed.
Headlight Dipping: You must dip your headlights in the following situations:
When meeting oncoming traffic.
When following behind another vehicle.
In well-lit urban areas.
In conditions of dense fog, falling snow, or heavy rain.
At dusk or dawn.
Horn Restrictions: Use of the horn is generally prohibited between the hours of and , unless it is a case of emergency to prevent an accident.
People in Authority: You must stop your vehicle when signaled to do so by:
A member of the Garda Síochána (police officer).
A School Warden.
A person in charge of animals (such as cattle or horses).
Hazard Warnings: Seeing a red triangle placed on the road signifies that there is a hazard, obstruction, or a broken-down vehicle ahead.
One-Way Street Entry: If you were to approach a one-way street from the wrong end ("No Entry"), you would see a continuous white line across the road, often accompanied by a broken white line behind it and signs indicating "No Entry."