Skip to main content
CrashStats

Serious A355 crash in Buckinghamshire on 29 April 2025 at 07:45 involving a Sinnis Terrain motorcycle

A Sinnis Terrain motorcycle and a Mazda CX-30 were involved in a crash on the A355 in Buckinghamshire at 07:45 on Tuesday 29 April 2025. The 40-year-old male rider of the Sinnis Terrain motorcycle was seriously injured.

It happened in daylight in fine weather on a dry single carriageway with a 50 mph limit, away from any junction.

Severity
Serious
Date
29 Apr 2025
Tuesday, 07:45
Vehicles
2
Sinnis Terrain and Mazda CX-30
Casualties
1
1 seriously injured

Location of the crash

Police recorded the crash at latitude 51.6626, longitude -0.61326, in the HP7 postcode district. It is one of the crashes that make up the Amersham & Chesham Bois, Buckinghamshire, HP7 0EZ area accident hotspot. The location was in the former Chiltern district.

Map of where the crash happened in Buckinghamshire

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

  • 1 crash
  • Serious

Collision details

Basic information

Reference
2025430207656
Council area
Buckinghamshire
Police force
Thames Valley
Police attended the scene
Yes

Road and location details

First road class
A
First road number
355
Road type
Single carriageway
Speed limit
50 mph
Urban or rural
Rural
Trunk road
Non-trunk road

Junction information

Junction type
Not at junction or within 20 metres

Pedestrian crossing information

Crossing facilities
No physical crossing facility within 50 m

Environmental conditions

Light conditions
Daylight
Weather
Fine, no high winds
Road surface
Dry

Enhanced collision data

How severity was recorded
Judged by the reporting police officer
Estimated chance it was serious
100%
Estimated chance it was slight
0%

The 6 nearest recorded crashes

The nearest, 17 metres away, was a slight injury crash on 18 September 2014.

Vehicles involved (2)

  • Vehicle 1: Sinnis Terrain

    Motorcycle 125cc and under

    Manoeuvre
    Going ahead
    Travelling from
    North
    Travelling to
    South
    Position at junction
    Not at or within 20 metres of junction
    First point of impact
    Front
    Left-hand drive
    No
    Driver sex
    Male
    Driver age
    40 years
    Engine capacity
    125 cc
    Fuel or propulsion
    Petrol
    Driver home area deprivation
    20 to 30% least deprived
    Distance from driver's home
    5 to 10 km

  • Vehicle 2: Mazda CX-30

    Car

    Manoeuvre
    Going ahead
    Travelling from
    North
    Travelling to
    South
    Position at junction
    Not at or within 20 metres of junction
    First point of impact
    Back
    Left-hand drive
    No
    Driver sex
    Female
    Engine capacity
    1,998 cc
    Fuel or propulsion
    Petrol
    Driver home area deprivation
    10% least deprived
    Distance from driver's home
    20 to 100 km

Casualties (1)

  • Casualty 1: Rider

    Serious

    Male, aged 40, motorcyclist (125cc and under), on vehicle 1 (Sinnis Terrain)

    Home area deprivation
    20 to 30% least deprived
    Distance from home
    5 to 10 km

Data source

This record comes from the Department for Transport’s road safety data (STATS19), in which police forces in Great Britain record every road crash reported to them where someone was injured. It is reference 2025430207656 in the data published on GOV.UK under the Open Government Licence v3.0, and one of the crashes counted in the Buckinghamshire road accident statistics for 2025.