query: What's tar gravel?
passage: Gravel and Tar
Gravel and Tar is a one-day cycling race held annually in New Zealand since 2016. It is rated 1.2 and has been part of UCI Oceania Tour since 2018.[1]
passage: Beach
A gravel ramp is formed by excavating the underlying loose sediment and filling the excavation with layers of gravel of graduated sizes as defined by John Loudon McAdam. The gravel is compacted to form a solid surface according to the needs of the traffic. Gravel ramps are less expensive to construct than concrete ramps and are able to carry heavy road traffic provided the excavation is deep enough to reach solid subsoil. Gravel ramps are subject to erosion by water. If the edges are retained with boards or walls and the profile matches the surrounding beach profile, a gravel ramp may become more stable as finer sediments are deposited by percolating water.