Reference
Road & bridge standards
Plain-English reference pages on the published standards that govern signage, parapets, speed limits and bridge inspection in Ireland.
- W009R warning signThe Irish road sign warning of a side road on the outside of a bend.
- Chevron boards W062Directional chevron boards marking a sharp change of direction.
- Bridge parapet containment heightWhy a vehicle parapet's height is measured from the road surface, and the modern standard.
- Special speed limit ordersHow a local speed limit is set or changed on an Irish road.
- Principal bridge inspectionWhat a principal inspection of a road bridge is, and how often it is done.
- Road restraint systems on bridgesThe purpose of a vehicle restraint system where there is a drop.
- Chainage on a road works scheduleWhat 'chainage' means when reading a council roads programme.
- Surface dressing and resealing (RSR)What a road reseal is, and how it changes a road surface.
- Sight Distance and Stopping Sight DistanceThese standards define the minimum unobstructed view a driver needs to safely react to hazards or stop their vehicle.
- Junction Visibility SplaysThese standards specify the clear, unobstructed areas required at junctions to allow drivers to see approaching traffic.
- Road Markings: Centre Line and Edge LineThese standards dictate the design, placement, and materials for lines that define the centre and edges of a carriageway.
- Hazard Warning LineThis specific road marking warns drivers of an upcoming hazard or a change in road conditions requiring extra caution.
- Anti-Skid High Friction SurfacingThis standard relates to the application of specialised road surface treatments designed to significantly increase skid resistance.
- Road Traffic ActsThese are primary legislative documents that govern all aspects of road use, including vehicle standards, driver behaviour, and road infrastructure.
- Road Drainage and GulliesEffective road drainage is crucial for road safety and longevity, preventing water accumulation that can lead to aquaplaning and structural damage.
- Camber and CrossfallCamber and crossfall are essential geometric features of road design that ensure surface water drains effectively from the carriageway.
- Superelevation on BendsSuperelevation, or 'banking', on road bends is a design feature that helps vehicles safely navigate curves by counteracting centrifugal forces.
- Kerbing and Edge DetailsKerbing and edge details define the boundaries of the carriageway, providing structural support, drainage control, and safety for road users.
- Passive Safety of Roadside FurniturePassive safety standards for roadside furniture aim to minimise the severity of injuries to vehicle occupants in the event of a collision.
- Bridge Load Ratings (BD 21/01)This standard outlines the methodology for assessing the load-carrying capacity of highway bridges and structures.
- Scour Protection at Bridge Piers (BD 97/12)This standard details the requirements for protecting bridge foundations from erosion caused by flowing water.
- Bridge Parapet Types (BD 52/93)This standard classifies and specifies the performance requirements for different types of bridge parapets.
- Bridge Inspection Intervals (BD 63/17)This standard sets out the frequency and types of inspections required for highway bridges and structures.
- Masonry Arch Assessment (BD 21/01)This standard provides guidance on the assessment of the load-carrying capacity of masonry arch bridges.
Last updated 2026-09-08. This is a living record — findings are added as dated entries and prior versions remain visible.