In the UK, Elite and Cat 1+2 riders often race together whilst Cat 3+4 riders race separately; however Elite and Cat 1+2+3 and 4th category only events are also common. Some events known as a handicap races allow Elite and Cat 1+2+3+4 riders to compete in the same race with riders from the different categories being set off at defined intervals starting with the 4th category. Most events contain a women's race which accepts all categories of female riders; however some women's events are only open to higher category riders, whilst some events allow women to compete with category Cat 3+4 men.