Rumble strips are safety features, which are designed and installed along the road to mitigate the risks of vehicles leaving their intended path on the carriageway and therefore the resulting incidents. Rumble strips are seen internationally as one of the lower cost and easier to install road safety measures which can achieve considerable incident reductions.

Effectiveness of rumble strip installation has been shown through a large number of research studies from around the world. Even though the predicted level of benefits can differ from one study to another, there is unanimity that the effect is beneficial.
While rumble strips in the UK are placed primarily on the edge of dual carriageways to mitigate run-off-road (RoR) incidents, in other countries they are also placed on the edge as well as the centre line of single carriageways to mitigate head-on, side swipe and RoR incidents. This presents a good opportunity for Highways England, because single carriageway sections of the SRN are not up to the same safety standard as the dual carriageway sections.

Currently only the raised rumble strips are used in the UK. However, new and innovative rumble strip patterns, such as the sinusoidal design, are increasingly being utilised in the USA and Europe for their higher benefits compared with the traditional types.

In contrast to its benefits, rumble strip installation may have some drawbacks which need to be considered during site selection and placement design. These considerations and the international best practice in mitigating them are presented in detail within this report.

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