motorcyclist can really claim to be placing only himself at risk. In France, a limit on motorcycle power to had no proven safety benefit and was repealed in 2016. Talks about mandatory speed limiting devices have been unpopular in the motorcycle communities in countries such as the UK and Sweden. Rallies and motorcyclists' right organizations have worked to inform public officials about the negative impacts of such restrictions on their communities, with no reports of such regulations having been implemented. These groups have encouraged increased focus on rider training and roadside safety measures, the large percentage of accidents due to alcohol and drug use, non street-legal motorcycles, and the presence of riders who do not have a valid motorcycle license. Roadway design and maintenance Roads are primarily designed for their main users, cars, and are seldom engineered with motorcycle specific safety in focus. The choice of roadside barriers and guardrails to prevent vehicles from crossing over a median or running off the road have proved to be dangerous for motorcyclists, as they are designed to dissipate braking energy for much heavier and structurally tougher cars and trucks. Moreover, they are designed to be impacted on the sliding rail and not at their support poles, which act as swords to unprotected road users. Statistical explanation for the automobile bias is found in use and fatality figures; motorcyclists are in numerical minority. Road surface can also contribute to a crash. A sudden change in the surface can be sufficient to cause a momentary loss of traction, destabilizing the motorcycle. The risk of skidding increases if the motorcyclist is braking or changing direction. This is due to the fact that most of the braking and steering control are through the front wheel, while power is delivered through the rear wheel. During maintenance, the choice of material can be inadequate for motorcycles. For example, asphalt sealer is used to fill and repair cracks in asphalt paving, but this often creates a slick surface that can cause a motorcycle to lose traction. Sometimes, steel plates are used as temporary covers over road trenches. The sliding nature of those, combined with an inappropriate installation can cause incidents. Australian motorcycle advocate Rodney Brown writes that the nature and likely consequences of hazards differ significantly for motorcyclists compared to drivers of other vehicles. For example, the current highway standards in the US permit pavement ridges of up to