Huw Edwards informs the audience there is roughly 30 minutes left of the debate.

Carwyn Jones for Labour defends their plans for the M4 relief road but also calls for electrification of rail lines in south and north Wales.

Lib Dem Kirsty Williams says we "can't blow the whole budget on one road in south Wales", and calls for the re-opening of old railway lines and better rural bus services.  

Rural areas also need decent broadband so people don't need to move to the cities, she says.

Tory Andrew RT Davies claimed Labour had "squandered" many opportunities over its 17 years in power to improve transport links around Wales.

A follow-up question asks what the parties would do to improve the nation's infrastructure.

Plaid Cymru's Leanne Wood and UKIP's Nathan Gill both cast doubt on the £1bn plans for an M4 relief road around Newport, saying the money could be better spent more evenly across Wales.

Alice Hooker-Stroud of the Greens wants a fund for national infrastructure - local council money invested in fossil fuel companies around the world - about £500m - should be re-invested in Wales.

A man in the audiences raises the issue of enterprise zones, claiming the aerospace zone in the Vale of Glamorgan has been an "abject failure", creating a mere handful of jobs.

Another man points to a Labour government in 1978 closing his father's steelworks in Treorchy, claiming the party's record is "not unblemished".

A woman points out that Prime Minister David Cameron said all parties needed to work together to save the steel industry but he hadn't invited Carwyn Jones as Wales' First Minister to his meeting with Tata management in Port Talbot yesterday. 

Kirsty Williams claims there is a "brighter future" for the blast furnaces of Port Talbot.  

She says it would be a "foolish government" which did not save its own steel industry, in the same way that a nation needs to produce its own food.

Ms Williams also accused UKIP's Nathan Gill of voting against anti-dumping measures in the European Parliament as an MEP - "shame on you!"

Carwyn Jones says he grew up near steelworks and cannot imagine Wales without a steel industry, pledging to do all he can to save it.

We need to deal with energy costs, he says, and claims the UK government has opposed tougher EU tariffs on cheap Chinese steel.  

He too calls for the use of Welsh steel in British infrastructure projects.

UKIP's Nathan Gill says the UK cannot save its steel industry unless it leaves the European Union.

Green leader Alice Hooker-Stroud says there is no reason why Indian-owned Tata should care about the communities their workers come from. 

She calls for other models of ownership, such as by the community itself, using Welsh steel for renewable energy projects.

  BBC Radio 5 Live reporter Mark Hutchings tweet:  

Plaid Cymru leader Leanne Wood speaks of the "ripple effect", saying her father lost his job as a result of the closure of coal mines.

She calls for the use of Welsh steel in major projects such as the Swansea Bay tidal lagoon. 

"We called for action back in January", she says, adding "we're losing valuable time".

If we can bail out the banks, we can help the steel industry, she adds.

Welsh Tory leader Andrew RT Davies insists there is a future for the Welsh steel industry, pointing to the UK government's pledge of a 25% stake in any rescue plan.  

He also says there needs to be help on energy costs, business rates and the need for a thriving economy.

Steel worker Neil Woodcock asks the second question: "What are you going to do to save the steel industry in Wales?"

Welsh Tory leader Andrew RT Davies is adamant when asked by a man in the audience if his party would impose a contract on junior doctors as the UK government had, leading to strike action.

"No," he said. 

Plaid Cymru's Leanne Wood says health and social care need a closer relationship - she claims all parties agree but only hers is advocating it.

She claims it's a "scandal" that some treatments available elsewhere in the UK aren't available in Wales.

But Andrew RT Davies claims Plaid voted against a cancer drugs fund for Wales.

Ms Wood says her preferred fund would look at other rare treatments too.

BBC Wales political editor Nick Servini on the parties' responses to the NHS. 

Guardian journalist Elena Cresci tweets:

A woman claims Wales is getting "second rate health care" with some treatments available in England but not in Wales. 

Carwyn Jones says people will get cancer treatment more quickly in Wales, and says the cancer drugs fund in England has ended. He proposes a fund to cover all life-threatening treatments, not just cancer.

Tory leader Andrew RT Davies insists the cancer drugs fund in England has worked but admits that cancer is "a tough nut to crack". 

Lib Dem Kirsty Williams says Welsh cancer patients also need advanced radiotherapy of the kind available in England. People are forced to shout loud for the care they need, she claims.

The questioner, Dr Maaz, says Plaid Cymru's points are "closer to his heart".  

"It's still not working," he says of Labour's efforts to improve NHS performance.

More treatment needs to take place outside A&E to relieve the pressure on the department, he says.

Carwyn Jones defends Labour's handling of the NHS, saying they're spending a bigger share of the Welsh Government's budget on health than ever before.

A&E is a challenge - demand goes up every year, he says.  

We're doing more to prevent a situation where people such as the elderly go to A&E because it's the only option, he adds.

Green leader Alice Hooker-Stroud says she wants to take it back to basics by encouraging a healthier society, with people in warm homes and secure employment, safer walking and cycling routes.

She says this will tackle the "root cause" of poor health, before people seek treatment.

Ms Hooker-Stroud also says health services should have the resources they need, which Labour had not delivered.