The top 10 most delayed routes have been revealed ahead of what is said to be one of the busiest times on UK roads, as the summer holidays draw to an end.
Traffic information supplier Inrix has published the worst locations which it expects to be clogged up this weekend, as well as the expected amount of extra journey duration compared with free-flowing traffic.
Unsurprisingly, routes such as the M25 and M6 both appear prominently on the list, with journeys on the M25 clockwise between junction 14 and 24 estimated to take 3.3 times longer today and Saturday.
Popular holiday locations in Devon and Cornwall, the Lake District and East Anglia loom large, as families rush back home for the start of the school year.
Inrix has revealed the data alongside the days it expects the roads to be the most congested.
Inrix chief economist Graham Cookson said: "All good things must come to an end. Sadly for most, the end of the summer holidays heralds a return to work, school and traffic.
"Holidaymakers hoping to make the most of the remaining few days should be aware that traffic will be worst on Monday afternoon and evening."
Below is the list of the 10 expected worst routes over the weekend, with the day and extra journey duration, compared with normal free-flowing traffic.
1. M25 clockwise (J14-J24) – Today – 3.3 times longer
2. M25 clockwise (J14-J24) – Saturday – 3.3 times longer
3. M6 southbound (J20-J11A) – Monday – 2.8 times longer
4. M23 northbound (J11-J8) – Saturday/Sunday – 2.8 times longer
5. M6 northbound (J11A-J20) – Monday – 2.7 times longer
6. M6 northbound (J29-J15) – Today – 2.5 times longer
7. M5 northbound (J29-J15) – Monday – 2.2 times longer
8. M4 eastbound (J32-J47) – Today – 2.1 times longer
9. A11 westbound Norwich to Thetford – Monday – 2.0 times longer
10. A66 westbound Scotch Corner to Penrith – Monday – 1.9 times longer