The speed adopted when driving over a round-top road hump will depend on the discomfort it generates (expressed in terms of vertical acceleration felt by the driver). A road hump should cause little discomfort at the design speed (V85), but sufficient vertical acceleration at higher speeds to encourage drivers to reduce their maximum speeds.
BRRC has been monitoring the growing interest in road safety audits and inspections for a number of years. As early as in 2002, the Centre participated in the activities of the European Road Federation (ERF).
On 29th November 2008, directive 2008/96/EG of the European Parliament and the Council of 19th November 2008 on road infrastructure safety management was published in the Official Journal of the European Union.
Each road traffic “participant” is liable to be involved in an accident. Various factors play a role in this risk. Accidents are very rarely the result of a single unsafe action; they generally imply a chain of circumstances and events that may lead to an accident-prone situation. The following diagram (known as the Swiss Cheese Model) suggests that various types of error (“latent errors” and “unsafe actions”) must be present at the same time to cause an accident.
A little less than 40 % of all road fatalities result from collisions with roadside obstacles. Collisions with such isolated obstacles are about twice as lethal as on average and cause 1.6 times more serious injuries as on average. Natural obstacles (such as trees) are by far the largest group. Additionally, considerable numbers of lives are lost in collisions with lighting columns and other road equipment.
Collisions with lighting columns and other robust support structures account for slightly less than 10 % of the total number of road deaths. Yet for lighting columns and for sign or signal poles there are alternatives that are not inferior in functionality to conventional rigid structures. This makes a major difference for the occupants of a passenger car running into such a support structure.
Raised traffic calming devices (road humps) which are meant to reduce the speed of traffic on public highways to a maximum of 30 km/h have to meet the siting conditions and technical specifications laid down in the royal decree of 3rd May 2002, which has amended a previous royal decree of 9th October 1998. The changes introduced by the new decree consist mainly of tolerances in dimensions.