Dual-site services

A dual-site service area (commonly referred to as a twin site) is one which has an amenity building and parking areas on both sides of the road. It doesn't matter whether or not there is a footbridge between the two sides.
This layout was used by the first few motorway service areas, and was pretty much the only layout that was considered until the 1970s. By then the high costs were putting developers off. New dual-sided motorway service areas are very rare, because it is cheaper and less environmentally damaging to build single-site services.
Where there is a single amenity building that straddles the motorway, like at Keele, we do not regard that as a dual-site service area. Most professionals would argue that the fact there are two sets of car parks is enough to describe it as a "twin site", but our lists are based on the building design.
Most operators and brands will count each side of a twin-site service area separately, probably because it inflates the figures. We tend to count them as one as they function like a single-sided site.
List of dual-site services
The following British motorway service areas are of the dual-site form:
- Birch (M62 between J18 and J19)
- Clacket Lane (M25 between J5 and J6)
- Corley (M6 between J3 and J3A)
- Fleet (M3 between J4A and J5)
- Frankley (M5 between J3 and J4)
- Gloucester (M5 between J11A and J12)
- Hartshead Moor (M62 between J25 and J26)
- Heart of Scotland (M8 between J4 and J5)
- Heston (M4 between J2 and J3)
- Hilton Park (M6 between J10A and J11)
- Lancaster (M6 between J32 and J33)
- Leigh Delamere (M4 between J17 and J18)
- Membury (M4 between J14 and J15)
- Michaelwood (M5 between J13 and J14)
- Newport Pagnell (M1 between J14 and J15)
- Northampton (M1 at J15A and A43)
- Reading (M4 between J11 and J12)
- Rivington (M61 between J6 and J8)
- Rownhams (M27 between J3 and J4)
- Sandbach (M6 between J16 and J17)
- Southwaite (M6 between J41 and J42)
- Strensham (M5 between J7 and J8)
- Taunton Deane (M5 between J25 and J26)
- Tebay (M6 between J38 and J39)
- Tibshelf (M1 between J28 and J29)
- Toddington (M1 between J11 and J12)
- Todhills (M6 between J44 and J45)
- Trowell (M1 between J25 and J26)
- Warwick (M40 between J12 and J13)
- Washington (A1(M) between J64 and J65)
- Watford Gap (M1 between J16 and J17)
- Winchester (M3 between J8 and J9)
- Woodall (M1 between J30 and J31)
- Woolley Edge (M1 between J38 and J39)
A-roads
This list shows all signposted A-road service areas. Where two sites are around a mile apart, they are counted as dual-site. Where only one side of the road is regarded as official, they are still included here.
- Alwalton (A1 at Peterborough)
- Astwick (A1 between Stevenage and Biggleswade)
- Attleborough (A11 between Thetford and Norwich)
- Balhaldie (A9 between Dunblane and Perth)
- Barnsdale Bar (A1 between Doncaster and Pontefract)
- Blenheim (A44 westbound at Yarnton)
- Breakspears (A414 west of M1 J6)
- Budbrooke (A46 between Stratford and Coventry)
- Calcutt (A419 between Cirencester and Swindon)
- Capel St Mary (A12 at J32a)
- Derby South (A50 near Derby)
- Detling Hill (A249 between Maidstone and the M2)
- Dumbarton Gateway (A82 between Glasgow and Dumbarton)
- Easington (A19 between Seaham and Easington)
- Elwick (A19 between Easington and Middlesbrough)
- Emsworth (A27 between Portsmouth and Chichester)
- Eynsham (A40 between Oxford and Cheltenham)
- Family Farm (A34 between Oxford and M40)
- Feering (A12 between J24 and J25)
- Gateway (A55 between J33A and J33B)
- Gledrid (A5 between Oswestry and Ruabon)
- Grange Park (A45 between the M1 and Northampton)
- Great Dunmow (A120 between the M11 and Braintree)
- Hull West (A63 between the M62 and the Humber Bridge)
- Ingleby Arncliffe (A19 between Middlesbrough and Thirsk)
- Kettering (A14 between J8 and J9)
- Kinmel Park (A55 between J24A and J25)
- Liphook (A3 between Hindhead and Petersfield)
- Luxmore (A180)
- Monmouth (A40 between Newport and Monmouth)
- Nene Valley (A45 between Northampton and Wellingborough)
- Newmarket (A11 and A14 near Newmarket)
- Orsett Cock (A13 near Stanford-le-Hope)
- Picket Post (A31 between Southampton and Ringwood)
- Popham (A303 near Basingstoke)
- Prizet (A591 between Kendal and Sizergh)
- Pyecombe (A23 between Crawley and Brighton)
- Ripley (A3 between Kingston-upon-Thames and Guildford)
- Ross Spur (A449 south-westbound between M50 and A40)
- Stockbridge (A27 Chichester Bypass)
- Sutton Scotney (A34 north of Winchester)
- Symonds Yat (A40 between Ross-on-Wye and Monmouth)
- Thanet Way (A299 at Waterham)
- Thetford (A11 at Thetford)
- Thirsk (A168 between Thirsk and Dishforth)
- Thrussington (A46 northbound between Leicester and Newark)
- West Cave (A63 between the M62 and the Humber Bridge)
- Weyhill (A303 between Andover and Amesbury)
- Willington (A38 between Derby and Burton-upon-Trent)
Northern Ireland
- Lisburn (M1 between J3 and J6)
Ireland (Rep. Of.)
- Castlebellingham (M1 between J15 and J16)
- Enfield (M4 between J9 and J10)
- Kill (N7 between exits 7 and 8)
- Lusk (M1 between J4 and J5)