Transport and environmentPlaid CymruThis issue is devolved/partly devolved to the Welsh assembly, which is next up for election in 2021Key campaign pointsDeliver tidal lagoons in Swansea Bay, Cardiff and Colywn BayReform Red Meat Levy so £1m of funding stays in WalesReduce plastic waste with a deposit return schemeOppose construction and use of pylons in National Parks and Areas of Outstanding Natural Beauty
Transport and environmentLabourMain pledgesBring rail companies back into public ownership, including ScotRailExtend the HS2 high-speed rail line to Glasgow and EdinburghBan onshore fracking and safeguard the North Sea oil and gas industrySupport Scotland's rural ferry services such as CalMac and keep them in public hands
Transport and environmentSinn FeinThis issue is devolved/partly devolved to the NI Assembly, which is still without an executive after the power-sharing coalition broke downKey campaign pointsNot addressed in the manifesto
Transport and environmentLib DemsMain pledgesAn Air Quality Plan to prevent deaths by reducing air pollutionEnsuring British farming remains competitive and doesn't lose out in the event of Britain leaving the EUA diesel scrappage scheme, and a ban on the sale of diesel cars and small vans in the UK by 2025Ensure that new rail franchises include a stronger focus on customers
Transport and environmentSDLPThis issue is devolved/partly devolved to the NI Assembly, which is still without an executive after the power-sharing coalition broke downKey campaign pointsMaintain access to EU funding for environmental programmesEnd air passenger duty to support NI airports
Transport and environmentUKIPThis issue is devolved/partly devolved to the Welsh assembly, which is next up for election in 2021Key campaign pointsEncourage a Wales-wide convention to plan a fit for purpose transport infrastructure that helps businesses increase exportsInvest in rail infrastructure, creating new routes using proven high-speed technology already used in AsiaEncourage city regions to explore innovative, environmentally-sound transport solutions, such as monorail systemSupport innovations such as the tidal lagoon project proposed for Swansea Bay
Transport and environmentConservativeMain pledgesContinue strategic national investments including High Speed 2, Northern Powerhouse Rail and the expansion of Heathrow AirportSupport a Road Maintenance Fund in Scotland, inviting local authorities to bid for money to fix potholes etcDo not believe that more large-scale onshore wind power is right for ScotlandSupport the shale gas industry in Scotland, including by using powers devolved in the 2016 Scotland Act
Transport and environmentDUPThis issue is devolved/partly devolved to the NI Assembly, which is still without an executive after the power-sharing coalition broke downKey campaign pointsNot addressed in the manifesto
Transport and environmentAllianceThis issue is devolved/partly devolved to the NI Assembly, which is still without an executive after the power-sharing coalition broke downKey campaign pointsCut carbon emissions by adapting NI's energy useProtect existing EU environment directives by placing them into NI law after BrexitEnd air passenger duty to support NI airportsIncrease the range of direct flights and connections available from NIInvest in better public transport links to NI airports
Transport and environmentLib DemsMain pledgesIntroduce a diesel scrappage schemeExtend ultra-low emission zones to 10 more towns and citiesSet legally binding target of zero net greenhouse gas emissions by 2050Oppose fracking
Transport and environmentGreenMain pledgesPass an Environment Protection Act to safeguard and restore the environmentBan fracking and scrap plans for new nuclear power stationsRenationalise the railwaysCancel HS2 and all airport expansions
Transport and environmentLabourMain pledgesRenationalise Britain’s railways as franchises expireLet local councils take over bus services if they wish toNew clean air act to legislate against diesel fumesBan fracking
Transport and environmentUUPThis issue is devolved/partly devolved to the NI Assembly, which is still without an executive after the power-sharing coalition broke downKey campaign pointsNot addressed in the manifesto
Transport and environmentConservativeMain pledgesInvesting £40bn across the rest of this decade on transport improvementsWork with train companies and employees to agree to minimum service levels during industrial disputesExpand Heathrow airportRemove the "complexity and perverse pricing" of rail tickets
Transport and environmentLib DemsThis issue is devolved/partly devolved to the Welsh assembly, which is next up for election in 2021Key campaign pointsDevolve funding of Network Rail in relation to the Wales railway networkElectrify the north Wales main rail line and funding for a feasibility study into re-opening rail links between Aberystwyth and CarmarthenAbolish tolls on the Severn Bridge, after the costs have been recouped in 2018Invest in the South Wales Metro
Transport and environmentSNPMain pledgesKeep EU environmental rulesSet up a new Independent Aviation Noise AuthorityKeep cutting carbon emissions and push UK government to do the sameContinue to invest in new roads
Transport and environmentUKIPMain pledgesOppose Heathrow Airport expansion in favour of expansion of regional airportsScrap HS2Remove road tolls on public roadsRepeal the Climate Change Act’
Transport and environmentLabourThis issue is devolved/partly devolved to the Welsh assembly, which is next up for election in 2021Key campaign pointsAbolish the Severn Bridge tollsDeliver tidal lagoons, rail electrification and the Wylfa Newydd Nuclear Plant
Transport and environmentConservativeThis issue is devolved/partly devolved to the Welsh assembly, which is next up for election in 2021Key campaign pointsScrap tolls for all vehicles using the Severn CrossingsRoad improvements throughout Wales and continued modernisation of railway infrastructure