Whole-body vibration is the shaking or jolting transmitted through a vehicle seat or an operator's feet. It is a different hazard from hand-arm vibration caused by powered hand tools. For many employers, the practical issue is not a dramatic machine fault but the combination of rough ground, an unsuitable vehicle, poor seat adjustment, speed, posture and hours behind the controls. A focused assessment should identify where those factors combine and make the work less punishing before exposure becomes a persistent back problem.
Know when whole-body vibration needs attention
The Control of Vibration at Work Regulations 2005 apply where work exposes people to vibration. HSE identifies drivers of industrial trucks, construction and quarrying machines, tractors and other mobile equipment as groups that may experience whole-body vibration, especially on rough or uneven surfaces. Large shocks and jolts matter as well as continuous vibration.
Vibration is rarely the only explanation for back pain. Repeated climbing in and out, lifting, twisting to see a load, a badly adjusted seat and long periods in one posture can all contribute. That is why the assessment must look at the complete job rather than treating a manufacturer's vibration figure as the answer.
Start with the people who feel the route every shift. Ask which vehicles, journeys, surfaces, loads and tasks create the worst shocks. Review maintenance records, complaints, near misses and reports of back discomfort. Observe the work at normal operating speed, including yards, loading bays, temporary routes and potholes that may not appear on a site plan.
Use the exposure values properly
For whole-body vibration, the daily exposure action value is 0.5 m/s² A(8) and the daily exposure limit value is 1.15 m/s² A(8). Reaching the action value triggers a programme of technical and organisational measures. The limit value must not be exceeded. Employers must still reduce exposure so far as is reasonably practicable below those numerical thresholds; a calculation under the action value is not permission to ignore obvious shocks that can readily be controlled.
A(8) combines vibration magnitude with duration over an eight-hour reference period. Obtain representative vibration data from the manufacturer, a reliable database or measurements made by a competent person, then use realistic driving time. Engine hours are not automatically exposure hours, and a vehicle's nominal figure may not represent worn suspension, an incorrect seat setting or the actual surface.
HSE provides a whole-body vibration calculator to combine exposures from different machines. Record the source of each value and the assumptions used. If the result sits close to an action or limit value, or the work includes severe jolts, improve the evidence rather than relying on optimistic estimates. Weekly averaging is permitted only in limited circumstances and must not become a routine way of disguising high daily exposure.
HSE whole-body vibration calculator ↗ · Control of Vibration at Work Regulations 2005 ↗
Control the route, vehicle and way the job is organised
Eliminate avoidable driving first. Reposition materials, change the layout or use a conveyor or remote method where that removes repeated journeys. Repair potholes, broken transitions and badly rutted ground; keep routes clear and plan temporary works so a safe surface survives wet North East weather. Speed limits should reflect the surface and vehicle, then be supervised in practice.
Select equipment for the terrain and task. Tyres, suspension and seat suspension all affect the vibration reaching the driver. Maintain them, deal with defects promptly and ensure a replacement vehicle does not introduce a worse exposure. A suspension seat only helps when it is suitable, in good condition and adjusted for the operator's weight and reach. The wrong setting can amplify vibration.
Train operators to set the seat, use restraints, choose safe routes, control speed and report defects. Arrange work to reduce long uninterrupted driving and avoid placing heavy manual handling immediately after a prolonged mobile-plant task. Limiting time can support better controls, but should not replace route repair or suitable equipment. There is no personal protective equipment that prevents whole-body vibration exposure.
Related guide: forklift pre-use checks → · Related guide: manual handling risk assessment →
Turn route, vehicle and driving data into defensible controls.
HR + SAFETY can help review mobile-plant work, structure the whole-body vibration assessment and set practical actions for routes, maintenance and supervision.
Discuss a whole-body vibration assessmentInclude people who may be more vulnerable
Consult operators and make it easy to report back pain, numbness, discomfort or a vehicle that repeatedly bottoms out. Review individual needs confidentially. Someone with an existing back condition, a recent injury, pregnancy or another relevant health factor may need an adjusted route, vehicle, seat, driving period or temporary alternative duties. Do not make assumptions based on age or diagnosis; use competent occupational-health advice where the safe adjustment is unclear.
Do not copy a hand-arm vibration health-surveillance programme across automatically. HSE's current vibration introduction describes ongoing statutory health surveillance for hand-arm vibration syndrome. For whole-body vibration, concentrate on controlling the exposure, encouraging early symptom reporting and responding to individual fitness or health concerns. Record what was reported, what advice was obtained and what changed.
Review the assessment when the work changes
The assessment is not finished when a calculator produces a number. Revisit it after a route alteration, new vehicle, tyre or seat change, altered load, longer shift, reported symptom or evidence that controls are not working. Check the actual surface and vehicle condition, not just the paperwork.
Assign actions to named people with dates: facilities may own yard repairs, engineering the maintenance standard, operations the route and speed plan, and supervisors the checks and operator feedback. Keep the exposure estimate, photographs or route plan, consultation notes, defect history and completed actions together so the assessment explains why the remaining risk is acceptable.
Whole-body vibration assessment checklist
- List every vehicle, mobile machine, route and task that can transmit vibration or shocks.
- Consult operators and observe normal work on the actual surfaces and at realistic speeds.
- Identify posture, access, manual handling and visibility demands that add to back strain.
- Use representative vibration data and realistic exposure durations to calculate A(8).
- Repair routes and transitions, select suitable vehicles and maintain tyres, seats and suspension.
- Train operators to adjust the seat, control speed and report route or equipment defects.
- Consider individual vulnerability and obtain occupational-health advice where needed.
- Review after changes, symptoms, severe jolts or evidence that controls have deteriorated.
Treat whole-body vibration as an operational problem, not just a measurement exercise. The strongest controls usually make the route smoother, the vehicle more suitable and the driving task better organised. Use exposure calculations to test the plan, then keep listening to operators and checking that surfaces, seats and suspension remain effective.
This guide provides general information for UK employers. It is not legal advice and should not replace advice based on the facts of a specific matter.