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CrashStats

B4603 accidents: crash map and statistics

Police recorded 718 collisions on the B4603 from 1981 to 2025, with 982 casualties. Of those crashes, 9 were fatal and 94 serious, and 13 people were killed.

In 2025 there were 3 collisions on the B4603, down 50% from 6 in 2024, with 4 casualties.

Collisions since 1981
718
1,471st highest of 4,923 roads
Casualties
982
1.37 per collision
Fatal collisions
9
13 people killed
Serious collisions
94
114 seriously injured
Collisions in 2025
3
Down 50% on 2024
Casualties in 2025
4
Down 33% on 2024

Crash severity on the B4603

On the B4603, 1.3% of collisions were fatal and 13% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1981 to 2025

  • Fatal91.3%
  • Serious9413%
  • Slight61586%

Where the B4603 ranks among 4,923 roads

Most collisions
1,471st
Most casualties
1,455th
Most fatal collisions
1,807th
Most serious collisions
2,022nd

B4603 accidents by year

Collisions on the B4603 peaked at 37 in 2006 and were down to 3 in 2025.

Collisions and casualties on the B4603, 1981 to 2025

  • Collisions
  • Collisions in 2025: 3
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202534
202466
2023710
202267
20211015
202099
20191011
20181519
20172030
20162128
20151929
20142628
20132130
20122432
20111519
20101526
20091418
20081825
20071620
20063745
20052834
20043150
20033045
20021220
20011934
20002532
199923
19981013
19971727
19962431
19951214
19941418
19932036
19922638
19911819
19902333
19892438
1988912
198778
19861721
19851216
198456
1983910
19821112
198111

When crashes happen on the B4603

Friday has the most collisions on the B4603 (121), and 3pm to 6pm is the busiest time of day (187).

Collisions by day of the week

  • Monday93 (13%)
  • Tuesday98 (14%)
  • Wednesday114 (16%)
  • Thursday120 (17%)
  • Friday121 (17%)
  • Saturday92 (13%)
  • Sunday80 (11%)

Collisions by time of day

  • Midnight to 3am27 (3.8%)
  • 3am to 6am11 (1.5%)
  • 6am to 9am65 (9.1%)
  • 9am to noon109 (15%)
  • Noon to 3pm128 (18%)
  • 3pm to 6pm187 (26%)
  • 6pm to 9pm102 (14%)
  • 9pm to midnight89 (12%)

Collisions by month

  • January62 (8.6%)
  • February51 (7.1%)
  • March64 (8.9%)
  • April55 (7.7%)
  • May46 (6.4%)
  • June56 (7.8%)
  • July54 (7.5%)
  • August58 (8.1%)
  • September60 (8.4%)
  • October69 (9.6%)
  • November78 (11%)
  • December65 (9.1%)

Light conditions at the time

  • Daylight496 (69%)
  • Dark, street lights lit188 (26%)
  • Dark, street lights unlit18 (2.5%)
  • Dark, lighting unknown9 (1.3%)
  • Dark, no street lighting3 (0.4%)
  • Not recorded4 (0.6%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4603 crashes

On the B4603, 98% of collisions happened where the speed limit was 30 mph and 71% on a dry road surface.

Speed limit at the scene

  • 20 mph7 (1%)
  • 30 mph703 (98%)
  • 40 mph2 (0.3%)
  • 50 mph5 (0.7%)
  • 60 mph1 (0.1%)

Weather at the time

  • Fine, no high winds556 (77%)
  • Raining, no high winds97 (14%)
  • Raining with high winds14 (1.9%)
  • Fine with high winds10 (1.4%)
  • Other10 (1.4%)
  • Not recorded31 (4.3%)

Road surface

  • Dry509 (71%)
  • Wet or damp201 (28%)
  • Frost or ice3 (0.4%)
  • Snow1 (0.1%)
  • Not recorded4 (0.6%)

Type of road

  • Single carriageway619 (86%)
  • Roundabout48 (6.7%)
  • Dual carriageway41 (5.7%)
  • One way street or slip road3 (0.4%)
  • Not recorded7 (1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4603 crashes

Car occupants make up 59% of the people killed or injured on the B4603, followed by pedestrians (19%).

Casualties by road user

  • Car occupant576 (59%)
  • Pedestrian191 (19%)
  • Motorcyclist94 (9.6%)
  • Bus or coach occupant57 (5.8%)
  • Cyclist32 (3.3%)
  • Taxi or private hire car occupant13 (1.3%)
  • Other18 (1.8%)
  • Not recorded1 (0.1%)

Vehicles involved

  • Car999 (78%)
  • Motorcycle94 (7.3%)
  • Bus or coach66 (5.1%)
  • Van or goods vehicle up to 3.5 tonnes45 (3.5%)
  • Pedal cycle33 (2.6%)
  • Taxi or private hire car24 (1.9%)
  • Other25 (1.9%)
  • Not recorded1 (0.1%)

Casualties by age

  • 0 to 521 (2.1%)
  • 6 to 1034 (3.5%)
  • 11 to 1546 (4.7%)
  • 16 to 20196 (20%)
  • 21 to 25139 (14%)
  • 26 to 35163 (17%)
  • 36 to 45127 (13%)
  • 46 to 55115 (12%)
  • 56 to 6550 (5.1%)
  • 66 to 7545 (4.6%)
  • Over 7544 (4.5%)
  • Not recorded2 (0.2%)

Drivers, passengers and pedestrians

  • Driver or rider502 (51%)
  • Passenger289 (29%)
  • Pedestrian191 (19%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4603

Map of the 25 most recent crashes on the B4603

Use the arrow keys to move the map and the plus and minus keys to zoom.

  • 25 crashes
  • Serious
  • Slight

B4603 crashes by council area

Collisions on the B4603 were recorded in 2 council areas. Swansea has the most, with 605, followed by Neath Port Talbot (113).

Collisions on the B4603 in each area, 1981 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSwansea605831580
2ndNeath Port Talbot113151414

B4603 crashes by town

Collisions on the B4603 were recorded in 3 towns and built-up areas, led by Swansea (468) and Clydach (107).

Recent crashes on the B4603

These are the 25 most recent collisions on the B4603, from 24 November 2021 to 12 November 2025.

Severity