 Its subsequent risk of head-on collisions, they are sometimes referred to as "suicide lanes".In some cases to reduce the risk, the road will be signed to prohibit overtaking when going downhill.Variations on this theme include altered road markings to highlight the climbing lane as being a temporary addition to the normal two (shorter dashed lines similar to those on merge/diverge lanes), or more clearly demarcating the two higher speed lanes (e.g.