Here is some of the reaction to the news.

The completion of the M74 will ensure that west central Scotland's connectivity is enhanced whilst alleviating the pressure on the busiest stretch of the M8 motorway through Glasgow.

The Scottish Government deserves warm congratulations for taking this tough decision so soon after obtaining parliamentary approval of their budget.

We are deeply disappointed with the decision to proceed with this pollution-generating motorway scheme. At a time when we really need to see concerted and joined-up action by government to reduce our climate emissions, the last thing we need is yet another road-building project.

Just imagine what amazing things could have been achieved if this �450m had instead been ploughed into public transport and schemes to reduce the need to drive.

This is great news. A decision on the M74 is long overdue and we are pleased that the Scottish Government has listened and responded to the case put forward by business and given the project the go-ahead.

It is imperative that construction gets under way as soon as possible, allowing businesses to build on the significant economic benefits the M74 will bring to Glasgow and the surrounding area, and helping the city to deliver for the economy of Scotland.

Today is a dark day for Glasgow, and a dark day for all those campaigning to tackle climate change. A sham tender process has been concluded with a sham review and an entirely irresponsible decision, given that the European Commission may pull the plug on the process altogether.

Whatever the commission decides, and whether or not the project goes ahead, ministers have today made an expensive mistake.

We welcome this news but are conscious that time is against us. If we are to make a success of the Commonwealth Games, the extension will have to be completed and open long before 2014, to ensure the movement of essential goods and services that will be necessary for the construction work.

The prompt and competently managed completion of the M74 extension is a vital part of meeting the commitments on athlete travel time that were made in the original bid document. However, putting these concerns aside, this development is excellent news for the economy of Glasgow, and the economy of Scotland as well.

It's sad that the government is going ahead with this disastrous road. This scheme was rejected by a public inquiry on both economic and environmental grounds.