Yahoo have revealed the busiest and nastiest motorways to avoid this weekend, and where you're most likely to get stuck behind caravans. See their recommendations below:

During the holiday season Britain’s roads instantly get clogged as every Tom, Dick and Harry decides to go to the coast at precisely the same time.

But how can you get from A to B without getting stuck halfway in-between? What are the most frustrating roads in Britain? Which roads are guaranteed to get your blood boiling and your engine overheated?

Well, we can tell you what your sat-nav won’t: Britain’s top five holiday traffic blackspots, as named by the people who really know - drivers!*

So without further ado, the infamous five are, in reverse order:

5) M6 northbound, Junctions 15 to 20
This 34-mile stretch takes in just about anywhere a family might want to get to for a day out. The M56 joins at Junction 20, taking vehicles to and from the holiday spots of north Wales and Manchester Airport. And Junction 15 leads to Britain’s largest theme park, Alton Towers.

4) M1 northbound, Junctions 21 to 28
On a bank holiday this section of the M1 can be 40 miles of misery. Junction 21 (Coventry) is where the M1 joins the M6 and M69. Junction 23a leads to the M42 and England’s second city, Birmingham. And Junction 24a takes drivers to Alton Towers from the East.

3) M1 northbound, Junctions 6a to 9
Junction 6a is where the M25 joins the M1. London’s famously-congested orbital motorway spews out cars and trucks from Heathrow Airport, the M40, M23, M4, M11 and M20. This extra pressure of traffic slows the M1 Northbound for 10 miles up towards Luton.

2) M25 clockwise, Junctions 23 to 31
As soon as it opened, the M25 became the butt of comedians’ jokes, dubbed the world’s largest car park thanks to its seemingly stationary traffic. From Junction 23 in Hertfordshire and Junction 31 in Essex can be 34 miles of slow-moving torture.

1) M25 both directions, Junctions 10 to 16
The A3, M3, Heathrow Airport, M4 and M40 all connect to the M25 on this 18-mile stretch. Not to mention Greater London’s two major theme parks: Chessington World of Adventures (Junction 10) and Thorpe Park (Junctions 11 and 13). If you want to get nowhere in a hurry, the M25 between Junctions 10 to 16 is a great place to listen to the radio at leisure.

* Based on a survey of drivers conducted by Auto Windscreens

Of course, it's not always heavy traffic that causes holiday misery. It's also worth noting on which roads you’re most likely to get stuck behind caravans. The UK’s leading provider of traffic news, Trafficlink, has compiled this list exclusively for Drive Smart.

Scotland
A82 past Loch Lomond and continuing through Glen Coe
A82 past Loch Ness up to Inverness mostly only single carriageway
The A921 coastal road through Burntisland

North-west England
M56 westbound towards Wales
A55 from the end of M53 towards the around Chester and onto Wales
A590 in Cumbria
A583 towards Blackpool off the M55
M6 around J32 (Blackpool Turn-Off)
M6 around J35 & J36 (Lake District)

North-east England
A171 coast road into Scarborough - much is single track
A615 between Scarborough and Filey - much is single track
A68 around the Northumberland National Park - much is single track

Midlands
A5 from Shropshire to the North Wales
A46 from Lincoln/Leicester to Skegness
A17 from Newark to Swineshead Bridge
A50 Stoke to Derby

Wales
A55 North Wales coast especially around the Britannia Bridge as it goes from 2 lanes to 1.
A48 from Nantycaws to the Pensarn Roundabout at the end of the M4 corridor
Heading towards Newquay and Aberystwyth A487 coast road - its a single track road with not very many straight sections to overtake

South-east England
A24 from London towards Worthing - much of it is single track and full of corners
A23 from London to Brighton
A27 all the way along the south cost from Portsmouth to Hastings - although most is dual carriageway
Norfolk A148 and the A140 both go to Cromer
A143 going to Great Yarmouth
A12 in Suffolk into Lowestoft
A3 in places though Hindhead because of roadworks. Traffic travelling from London to Portsmouth to get on the ferry
A20 in Dover for the ferries
A31 though the New Forrest

South-west England
A35 though Bridport
M5 all the way from Gloucestershire down to Devon
A30 A38 around the Splatford Split
A30 leading in to Cornwall through Bodmin

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