This map shows the section of the M4 that is frequently congested, and that would be bypassed if plans for a 14-mile relief road went ahead.
The Welsh government has long pushed for a relief road in this area. Plans were shelved in 2009 after the projected cost of the project rose to £1 billion.
More top news
Lady Colin Campbell's son has said she will not quit the jungle after her latest clash with Brian Friedman, as she is "not the losing type".
Stewart Greene killed nine-year-old Alex Robinson, who had a fear of water, after being left alone with him for less than an hour.
A protest against Black Friday sales, urging people to buy nothing at all instead, has attracted tens of thousands of supporters in the UK.