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This article contains information about a planned or expected future road. It may contain information of a speculative nature and the content may change dramatically as the road's construction and/or completion approaches and more information becomes available.

The M4 Toll (sometimes known as the M4 Newport Toll Bypass) is a planned toll motorway to be built around the south of the city of Newport, South Wales, and will be the United Kingdom's second full toll-paying motorway.^[1]

The existing M4 motorway Newport bypass runs through the Brynglas Tunnels, north of the city centre.^[2] However, the nature of the tunnels makes widening them prohibitively expensive. As a result, a second motorway will be built to the the south of the city, running for 14 miles (23 km) parallel to the current road from junction 23a at Magor to junction 29 at Castleton. The concept behind the motorway is based on the M6 Toll, a similar relief road built to reduce traffic on the M6 motorway around Birmingham.^[2]

Although another bypass around Newport had been suggested by various groups for several years, the M4 Toll was first announced on January 7, 2004 as part of a raft of measures to improve road transport in Wales. The road will cost GB£350m, being financed by a Public-Private Partnership with the Welsh Assembly.^[1]

Construction is expected to begin by 2009, with the tolling possibly using satellite tracking or radar-tag systems.^[3]

The road has received criticism from many corners, with concerns ranging from environmental issues, through cost, to long-term effects on traffic patterns.

Friends of the Earth have claimed that the road will cause great damage to local wild habitats as it is planned to pass through the Caldicot and Wentloog Levels, an area of natural wetlands. They have also raised concerns about the large sum of public money being used to fund the project, claiming that it could be better spent improving the local railway network.^[2]

Several other experts have called the project "a white elephant for 20 hours a day", due to the greatly variable traffic levels through the Brynglas Tunnels, claiming that outside peak hours, the tunnels would still be the preferable option to taking the toll road for most people.^[2]

Liberal Democrat spokesperson Jenny Randerson also raised concerns about whether a toll was necessary on the road, as the Severn Bridge, less than 10 miles (16 km) to the east, also charges a toll to cross it. Randerson compared the plan to a "double tax on Wales", claiming that the toll would discourage people from visiting Wales, saying "paying twice to get in will encourage no-one to come across the Severn Bridge, either for business or for pleasure", while the Road Haulage Association claimed the toll was "almost rubbing salt into the wound".^[2]

Concerns have also been raised about the risk of accidents on the road; cars on the M6 Toll, due to its new and clear carriageways, have an average speed of 79 mph (127 km/h), rising to 88 mph (142 km/h) at night, well above the British national speed limit of 70 mph (113 km/h). As a result, the M4 Toll has been compared to a theme park with drivers paying "their money and therefore [expecting] to be able to enjoy the thrill of the ride. It's almost as if they're paying to use a racetrack" said Conrad King, a motoring psychologist.^[3]

1. ^ ^{a b} CBRD M4 Toll Feature, URL accessed 3 August 2006
2. ^ ^{a b c d e} M4 Relief road plan unveiled, BBC News, 7 December 2004
3. ^ ^{a b} 'Racetrack' fear for new M4 toll section as speeds soar, Western Mail, January 4, 2005

	Motorways in the United Kingdom
Great Britain: M1 • M2 • M3 • M4 • M5 • M6 • M6 Toll • M8 • M9 • M10 • M11 • M18 • M20 • M23 • M25 • M26 • M27 • M32 • M40 • M42 • M45 • M48 • M49 • M50 • M53 • M54 • M55 • M56 • M57 • M58 • M60 • M61 • M62 • M65 • M66 • M67 • M69 • M73 • M74 • M77 • M80 • M90 • M180 • M181 • M271 • M275 • M602 • M606 • M621 • M876 • M898
A1(M) • A3(M) • A38(M) • A48(M) • A57(M) • A58(M) • A64(M) • A66(M) • A74(M) • A167(M) • A194(M) • A308(M) • A329(M) • A404(M) • A601(M) • A627(M) • A823(M)
	Northern Ireland: M1 • M2 • M3 • M5 • M12 • M22 • A8(M)	edit
Past: M16 • M41 • M63 • A18(M) • A40(M) • A41(M) • A102(M) • A6144(M)    Unbuilt: M12 • M13 • M15 • M31 • M64    Future: M4 Toll