Your Route From Carmarthen SA31 to Bristol BS10
Route Summary
100 mi
1 hour 46 mins
5
24 Miles
25 Minutes
Recommended travel books and guides
Great British Walkies: 100 brilliant dog walks
The Great British Bucket List: Utterly Unmissable Britain
52 Great British Weekends: A Year of Mini Adventures
AA Easy Read Britain 2026 flexi bound
2026 Philip's Big Easy to Read Britain Road Atlas
Where to Go When Great Britain and Ireland
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Route Map
Service Areas Along Route
Swansea West
M O T O, Swansea West Services, M4 Junction 47, Penllergaer, Swansea, West Glamorgan, SA4 9GT
Sarn Park
Sarn Park Motorway Services, Sarn Park Motorway Services Area, M4, Sarn, Bridgend, CF32 9SY
Cardiff West
Moto Services, Cardiff West Motorway Services Area, M4, Pontyclun, Mid Glamorgan, CF72 8SA
Cardiff Gate
Welcome Break Services, Malthouse Avenue, Cardiff Gate Business Park, Pontprennau, Cardiff, South Glamorgan, CF23 8RA
Magor
Magor Motorway Services Area, M4, Magor, Caldicot, Monmouthshire, NP26 3YL
Recommended motoring accessories for your car
Lewis-Plast Premium 92 Piece First Aid Kit
Car Seat Organiser
LISEN Retractable Car Phone Charger
AA Euro Travel Kit AA6318
Car Breakdown Emergency Kit
Zacro Car Bin with 5 Garbage Bags
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Step-by-Step Directions
Head south-west on St Catherine St towards Model Ct
0.25
At the roundabout, take the 1st exit onto Morfa Ln/
0.25
At the roundabout, take the 2nd exit onto A4242
0.25
At the roundabout, take the 1st exit onto A40
0.5
At Pensarn Roundabout, take the 2nd exit onto A48
11.0
At Cross Hands Roundabout, take the 3rd exit and stay on A48
1.75
Continue onto A48
2.0
At the roundabout, take the 3rd exit onto M4 heading to Caerdydd/
80.75
Swansea West M O T O, Swansea West Services, M4 Junction 47, Penllergaer, Swansea, West Glamorgan, SA4 9GT
Sarn Park Sarn Park Motorway Services, Sarn Park Motorway Services Area, M4, Sarn, Bridgend, CF32 9SY
Cardiff West Moto Services, Cardiff West Motorway Services Area, M4, Pontyclun, Mid Glamorgan, CF72 8SA
Cardiff Gate Welcome Break Services, Malthouse Avenue, Cardiff Gate Business Park, Pontprennau, Cardiff, South Glamorgan, CF23 8RA
Magor Magor Motorway Services Area, M4, Magor, Caldicot, Monmouthshire, NP26 3YL
Last minute travel essentials
Pill Organizer,Pill Dispenser With 7 Large Compartments
Hiluckey Power Bank Portable Charger - 22.5W Fast Charging
Rainberg Microfiber towel (180x90cm), Fast Drying
Teskyer Electronics Accessories Organiser Bag, Waterproof
BAGAIL Microfibre Travel Towel, Perfect Travel Towel
NTONPOWER Travel Extension Lead, travel Essentials
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At junction 20, exit towards Bristol(W)/
1.0
Slight right to merge onto M5
2.25
At junction 17, take the A4018 exit to Bristol (W)
0.25
At Cribbs Causeway Interchange, take the 1st exit onto Cribbs Causeway/
0.25
Turn left
0.0
Turn left
0.0
Turn right
0.0
Turn left
0.0
Arrive at your destination
Don't forget in-car food and drink essentials
SUNWILL Metal Water Bottle Stainless Steel 500ml
Thermos - Stainless King Red Travel Flask (1.2L)
Travel Mugs,KETIEE 380ml Insulated Coffee Cup with Leakproof Lid
Super Sparrow Water Bottle Stainless Steel - Insulated
Volhoply 14oz Insulated Stainless Steel Coffee Mug
Sistema KLIP IT PLUS Leakproof Food Storage Containers
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