The safest way to manage plant and vehicles on a construction site is to keep people and moving machines apart, plan the routes, control reversing, and make sure only trained and authorised people drive or operate plant. Plant and vehicles include excavators, dumpers, telehandlers, rollers, delivery lorries and ordinary vans, and they can seriously injure or kill pedestrians and drivers. The main causes of this harm are vehicles hitting people, vehicles overturning, and people falling from vehicles or being struck by loads.
Key takeaways
- Keep pedestrians and vehicles apart wherever possible, using separate routes, barriers and designated crossing points.
- Plan traffic routes in advance, preferably with one-way systems and layouts that avoid the need to reverse.
- Where reversing cannot be avoided, general practice is to use a trained banksman or signaller and keep everyone else out of the danger area.
- Only trained, competent and authorised people should operate plant and drive site vehicles.
- Make sure vehicles and plant are maintained, checked before use, parked safely and left secure when unattended.
The main hazards
The hazards fall into a small number of types, and each applies directly to construction. The controls described in this guide, including traffic routes, blind spot precautions, banksmen and stop blocks, are general practice rather than a list taken from HSE guidance.
People struck by vehicles
Pedestrians are hit by moving vehicles, most often when a vehicle is reversing or when people cross a vehicle route. Large plant has blind spots that mean the driver may not see someone standing close to the machine. A person who can see the machine cannot assume the driver can see them.
Vehicles overturning
Dumpers, excavators and other plant can overturn on slopes, soft ground, the edges of excavations and tipping points, or when loaded or driven badly. The risk increases with uneven ground, overloading and poor driving. Controls include firm, level routes, stop blocks at tipping points and edges, and sensible loading.
People falling from vehicles
Falls happen when people climb onto lorry beds or trailers, jump from cabs, or are carried where they should not be. Use proper access points, keep a firm hold when you climb, and never ride on plant that is not designed to carry passengers.
Loads and loading
Falling, shifting or badly secured loads can injure drivers, loaders and bystanders. Loading and unloading is a high-risk time because people and vehicles are close together.
Collisions between vehicles and with structures
Poorly planned routes, narrow gaps, overhead obstructions and poor visibility can lead to collisions with other vehicles, buildings, scaffolds, services and temporary works.
Planning traffic management
A traffic management plan is the site's overall scheme for how vehicles will enter, move around, load, unload and leave. A good plan starts at the design and planning stage of a project, not on the first day of work, and it should be reviewed as the site changes.
The main principles are:
- Segregation. Provide separate pedestrian and vehicle routes where possible, with physical barriers rather than just painted lines. Where they must meet, provide clearly marked crossing points with good visibility.
- Separate entrances. Where practicable, use different gates or entry points for people on foot and for vehicles.
- One-way systems. These reduce the need to reverse and avoid vehicles meeting head on in tight spaces.
- Layout that limits reversing. Provide turning areas, drive-through loading and unloading where possible, and defined loading zones.
- Visibility. Keep sight lines clear, provide good lighting, and make sure people wear high visibility clothing suited to the conditions.
- Controlled access. Make sure visitors and delivery drivers are met, briefed and directed. Do not let them wander into work areas.
- Surface and gradient. Maintain routes so they are firm, drained and free of potholes, and make sure inclines and edges are controlled.
The plan only works if it is communicated. Show people the routes at induction, put up clear signs, and review the arrangements when the site layout changes.
Reversing, banksmen and signallers
Reversing is one of the highest-risk movements on a site, because the driver's view to the rear is limited and people may be close without realising. The first aim is to design reversing out of the site layout. Where it cannot be avoided, control it.
- Use a trained banksman or signaller who stays in a safe position where the driver can see them at all times.
- Agree signals before the movement begins, and make sure the driver knows to stop if they lose sight of the signaller.
- Keep other people out of the danger area while the vehicle is moving.
- Make sure the driver and signaller are both clear about who has authority to stop the movement.
- Use mirrors, cameras and audible warnings as additional help, but not as a substitute for a signaller where one is needed.
If you are a pedestrian, stay out of reversing zones, use the marked routes, and make eye contact with the driver before you cross in front of a vehicle. Never walk behind a reversing vehicle, and never assume that the driver has seen you.
Driver and operator competence
Competence is a combination of training, experience and the authority to do the job. People who operate plant, such as excavators and dumpers, need appropriate training and, where your site or employer requires it, authorisation. Drivers of site vehicles need to know the site rules, routes, speed restrictions and any special arrangements.
Competence also includes behaviour. A competent operator checks the machine before use, uses seat belts or restraints where fitted, stays within the machine's limits, does not carry passengers unless the machine is designed for it, and does not use a phone while operating. They stop work if the conditions are unsafe.
Check CSCS, CITB and your employer's requirements for the current cards and certificates for your type of plant. This site is independent and does not set those requirements. See HSE's construction safety topics for further guidance on specific activities.
Maintenance, checks and parking
Plant and vehicles that are not maintained are a hazard in their own right. Brakes, steering, lights, warning devices, mirrors and seat belts should work, and defects should be reported and fixed before use.
- Do a check before using the machine and report defects. Do not use plant with a safety-critical fault.
- Park on firm, level ground, away from edges, excavations and pedestrian routes.
- Lower any raised attachments, apply the brake and remove the key or isolate the machine when you leave it, as your site rules require.
- Do not leave engines running unattended.
Where plant is used for lifting, the additional requirements are covered in our lifting operations safety guide. The wider rules on work equipment are covered in our guide to PUWER.
Quick reference table
| Hazard | Typical control |
|---|---|
| Pedestrians struck by vehicles | Segregated routes, barriers, marked crossings, high visibility clothing |
| Reversing accidents | Layouts that avoid reversing, trained banksman or signaller, exclusion of pedestrians |
| Overturning | Firm and level routes, edge protection, stop blocks, sensible loading |
| Falls from vehicles | Safe access points, no riding on non-passenger plant |
| Falling loads | Secure loads, safe loading zones, keep people clear |
| Unauthorised use | Trained and authorised operators, keys removed, plant secured |
Quick checklist for pedestrians:
- [ ] I use the marked pedestrian routes.
- [ ] I stay out of reversing and loading areas.
- [ ] I do not walk behind or close to moving plant.
- [ ] I make sure the driver has seen me before crossing.
- [ ] I wear the high visibility clothing required on site.
Practice check
These two questions are original and written for this site. They are not official CITB questions and not an official result.
Question 1. A dumper needs to reverse near a work area on foot. What is the best control?
- A. The driver reverses slowly and hopes nobody is there.
- B. A trained signaller guides the dumper while other people are kept out of the danger area.
- C. Pedestrians wave to the driver as it moves.
- D. The dumper reverses at the end of the shift only.
Answer: B. If reversing cannot be avoided, a trained signaller and keeping people clear of the danger area are the key controls.
Question 2. Why should you not assume a machine driver can see you?
- A. Drivers never look in their mirrors.
- B. Pedestrians are not allowed on site.
- C. Large plant has blind spots, so a person close to the machine may be out of sight.
- D. High visibility clothing makes you invisible.
Answer: C. Blind spots mean that a driver may not see someone who can see the machine, so make eye contact and stay in safe positions.
For more practice, see our free practice questions and the CITB HS&E test practice page. This site is independent and not affiliated with CSCS or CITB.
FAQ
Why are plant and vehicles so dangerous on construction sites?
They are heavy and powerful, have blind spots, and often work close to people in changing, uneven conditions. The main risks are people struck by moving vehicles, vehicles overturning, and falls from vehicles or loads. Planning routes and keeping people and machines apart reduce these risks.
What does a banksman do?
A banksman, also called a signaller, guides a driver or operator during movements where the driver cannot see clearly, such as reversing. They must be trained, stay where the driver can see them, use agreed signals and be able to stop the movement. Other people are kept out of the danger area.
Can I ride on site plant or in the back of a vehicle?
Only if the vehicle is designed to carry passengers and has a proper seat and restraint. Riding on plant not built to carry people, or in the back of a vehicle, is dangerous. Ask your supervisor what the site rules say.
Who is allowed to operate plant on site?
Only people who are trained, competent and authorised to use that type of plant. Your employer and the principal contractor set the requirements, and cards or certificates may be needed. Check the current rules with your employer, CSCS or CITB rather than relying on this site.
Sources
Independent guide, not affiliated with, authorised by, approved by or endorsed by CSCS or CITB. Last updated 2026-10-08.