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Important Traffic and Access Information: Sunday 24th March 2019

  • Categories : Press Release
  • 19 Mar 2019
Half-marathon start 2018

The Griffin Mill Merthyr Half-marathon will be taking place on Sunday 24th March 2019. This event is now in its 5th year and expects to attract around 800 runners, many of whom are fundraising for local and national charities.

Using the Trevithick and Taff Trail for the race will cause some temporary changes to usual traffic routes, for a limited period. In planning the event, every effort is made to minimise the disruption caused with the closing of roads. Where closures occur, well-signed diversions will be in place to ensure continued access around the town for motorists and public transport.

Roads to be closed, or partially closed, on Sunday 24th March 2019:

A4102 between Aldi & Rhydycar

Millbourne Terrace

High Street

Millbourne Close

Plymouth Street

Lower Mount Pleasant

Trevithick Gardens

Fernhill Close

Warlow Street

A4054 Cardiff Road between ends of Troedyrhiw to Merthyr Vale

Ernest Street

Lane at bottom of Treharne Street

Clare Street

Lane at bottom of Glyndwr Street

Bro Dowel

Gray’s Place

Pease Lane
Pontygwaith Bridge Road

Wesley Place


Canobie Crescent

Cwmdu Road


Ash Road

Nant Y Coed

Graig Road leading to Anthony Grove/Taff Trail

Gethin Street (Abercanaid)

Glyndyrus Close

Lewis Square

Road closures will be in operation from 9.30am until 2:30pm. The race starts at 10.00am and we will be operating a dynamic re-opening schedule from 10:40am onwards, with an approximate reopening schedule as follows:

Miles 1 – 2: reopen by 10.40am – This covers A4102, High Street, Plymouth Street, Trevithick Gardens, Warlow Street, Wernest Street, Clare Street, Bro Dawel, Pease Lane, Millbourne Terrace and Millborune Close.

Miles 2.5 – 5: reopen by 11.00am

Miles 5 – 6.5: reopen by 11.15am

Further information regarding these will be displayed on signage in the affected roads, in advance of the event.

We appreciate your understanding with any inconvenience you experience due to these restrictions, and hope this advance notice helps with planning your travel around the closures.

We welcome the support of our local residents, to come along and support our event on the day. The race will be close to your property so please come out and help cheer along our runners and support this fantastic community event.

Please do allow extra time for your journey, to enable you to carry out your journey on Sunday morning.
If you require any further information, or a detailed list of the diversions that will be in place, we can be contacted by email at

Kind Regards,

The Griffin Mill Half Marathon Event Team

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