The Welsh M1

It was created to connect north and south of the country, yet it takes four hours - sometimes more - to make the journey. It's certainly not the fastest road in the UK but to drive the A470 is to truly understand the landscape, history, culture and language of Wales.

In the first of two programmes, Cerys Matthews sets out on a road trip in search of a nation's identity and the essence of Welshness. She travels through the Welsh-speaking heartland of the north-west, meeting writers, musicians and historians. She falls into conversation on the streets of Llanrwst, encounters poetry in the paving stones of Blaenau Ffestiniog and discovers the roots of one of her favourite folk songs on the high passes of the A470 beyond Dolgellau.

The A470's route is ancient, its northern sections following the old Roman road, Sarn Helen.

Yet it's also modern: the politics of Wales are complicated by the challenge of bringing together a whole nation both geographically and symbolically. The road was created in 1979 by re-designating older roads. And that's why this tarmac tribute to nationhood winds back and forth across the Welsh landscape, apparently reluctant to reach its final destination.

As she travels south, Cerys hears many different definitions and descriptions of the A470: a road to nowhere; the road Wales deserves; a highway of loss; the Welsh M1.

Producer: Jeremy Grange

First broadcast on BBC Radio 4 in January 2014.

Cerys Matthews drives the A470, the highway running through the heart of Wales.

It was created to connect north and south of the country yet it takes four hours - sometimes more - to make the journey. It's certainly not the fastest road in the UK but to drive the A470 is to truly understand the landscape, history, culture and language of Wales.

Cerys Matthews continues her journey down the A470 in search of a nation's identity and the essence of Welshness.

As she travels south Cerys hears many different definitions and descriptions of the A470: a road to nowhere; the road Wales deserves; a highway of loss; the Welsh M1.

She discovers the crossroads of Wales in Rhayader, a town populated by rebels and red kites, she hears stories of the A470 from historians, poets, bikers and musicians and she finds herself serving customers in a roadside snack bar.

The A470 - and her journey - comes to an end in the re-vitalised Cardiff Bay, once known as Tiger Bay and now home to the Senedd, the seat of Welsh government. Here she meets Hassan Panero, a young poet from Cardiff's Somali community who gives Cerys his own definition of Welshness.

Producer: Jeremy Grange

First broadcast on BBC Radio in January 2014.

Cerys Matthews continues her trip down the A470, the road connecting north and south Wales

Cerys Matthews drives the A470, the highway running through the heart of Wales.