A stretch of the M5 bound for Birmingham is the worst traffic bottleneck in Britain, according to a new survey.
The section remained clogged for 63 hours a week in 2009/10, with jams averaging speeds of under 15mph, according to traffic information company Inrix.
An index published by the firm also showed that drivers in Manchester spend the most time stuck in traffic - at an average of 72 hours a year.
It also found that Wednesdays are the worst days for road congestion, while motorists are likely to come up against the heaviest morning traffic on Mondays, with the period between 8am to 9am the worst commuting hour.
Friday emerged as the best weekday for traffic overall, although it had the poorest record for evening commuting.
According to the study, the most congestion-free weekday commuting hour is 6am to 7am on Fridays.
The index also revealed that UK drivers spend more time in traffic compared with drivers in Belgium, France, Germany, Luxembourg and Holland.
London ranks second after Paris as the most traffic-clogged city among the six countries analysed.
According to the index, the top 10 worst UK traffic bottlenecks are:
1. Birmingham: The M5 heading towards Birmingham at the M6;
2. London: The Blackwall Tunnel Approach at Blackwall Lane in south-east London;
3. London: Canterbury Way heading towards the Queen Elizabeth II Bridge at the M25;
4. Newcastle: The A19 at the Tyne Tunnel North Approach;
5. London: Canterbury Way heading towards Purfleet at the M25 in east London;
6. London: The M25 headed towards Rickmansworth at junction 19 in Hertfordshire;
7. Glasgow: The M8 heading towards Kingston Bridge at junction 22;
8. London: The M25 heading towards Dartford at junction 18;
9. Glasgow: The M8 heading towards Kingston Bridge at junction 20;
10. Glasgow: The M8 heading towards Seaward at junction 21.
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