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Cardiff Half Marathon: What to know, from road closures to route

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More than 29,000 people have signed up to take part in the Cardiff Half Marathon .

The 13.1 mile ( 21km ) race starts at 09:50 BST on Sunday .

Transport for Wales ran additional trains to help runners and spectators into Cardiff.

Engineering works have closed lines between Treherbert , Aberdare, Merthyr Tydfil and Radyr .

Runners are told they must complete the 13.1 mile race in 4.5 hours , which is around the average walking pace. If runners fall behind the required pace to finish in this time, a sweep vehicle will collect them. Run4Wales said those who wish to continue after the race has ended should do so on the pavement, as roads re-open, and do so at their own risk. Can I wear headphones in the Cardiff Half Marathon ? Race organisers have said runners should avoid wearing headphones during the race to limit the risk of injury to themselves and others..