Road bumps: A key point in road safety

I read a news item on the death of a woman pillion rider with a helmet by falling from motor bike at a road bump in Bandarawela. It is a serious situation, and brings up a crucial point on road safety.

Following the report, I searched for the UK standards on road bumps to clear our minds. There are UK standards and regulations for ‘road humps’ (what many of us call speed bumps or bumpers). These are primarily governed by The Highways (Road Humps) Regulations 1999. These regulations are designed to ensure road humps are safe and effective, minimising risks to vehicles and riders while still achieving their purpose of slowing traffic. 

Here are the key points regarding UK standards for speed bumps.

Height: They must be a minimum of 25mm (about 1 inch) at their highest point. They must be no more than 100mm (about 4 inches) at their highest point. This maximum height is crucial to prevent damage to vehicles and ensure safety of people.

Gradient: Most important fact is that our road bumps are not spread out properly. The gradient should generally be no steeper than 1:10. In some cases, a shallower gradient might be required, especially on roads used by buses, emergency services, or those with specific inclines.

Vertical face: No vertical face of any material forming the speed hump should exceed 6mm measured vertically from top to bottom. This is designed to prevent harsh impacts.

Length All speed bumps must be a minimum of 900mm (about 3 feet) in length, measured parallel to the road’s centerline.

There are specific rules about where they cannot be placed, including within 30 metres of zebra-controlled areas (pedestrian crossings). And on a railway level crossing or within 20 metres of railway tracks. Within 25 metres of a bridge or structure over a carriageway, if the structure is 6.5 metres or less above the road surface. They can only be constructed on roads with a speed limit of 30mph or less.

Visibility and signage: Speed bumps must be clearly visible, with appropriate signage to alert drivers. This includes adequate street lighting, reflective markings, and specific traffic signs. Local authorities are required to consult with police and emergency services before installation.

Are the Sri Lankan authorities like the RDA and the Police, aware of these strict regulations?

- Sumith de Silva