In brief
In excavator, loader and backhoe accidents four scenarios stand out; the machine tipping over, striking a pedestrian in a blind spot, contact with underground or overhead lines, and falling while mounting or dismounting the machine. The Regulation on OHS in Construction Work requires ground checks, the appointment of a signaller, a cab that protects the operator in a tip-over and identification of services before excavation. Construction machinery undergoes a periodic inspection at least once a year.
Why should construction machinery operator safety be addressed separately?
Excavators, loaders and backhoes (backhoe loaders) working on construction sites, infrastructure projects and factory yards threaten both the operator and the pedestrians around them. Looking at accidents, four scenarios stand out: the machine tipping over, striking a person in a blind spot, contact with underground or overhead lines, and falling while mounting or dismounting the machine. Construction machinery operator safety needs separate measures for each of these four headings.
The basis for these measures is the provisions on excavation and materials-handling machinery in section (B) of Annex 4 of the Regulation on OHS in Construction Work. Site preparation work is in the very hazardous class in the 2025 hazard class list (NACE 43.12.00); in this class the specialist, physician and training obligations apply in their strictest form. For the general organisation of the site, see our articles on the construction site OHS checklist and the Regulation on OHS in Construction Work.
Tip-over: ground, slope and load
Backhoe tip-over usually results from a combination of three factors: ground with weak bearing capacity, a slope and a wrongly positioned load. The Regulation requires the firmness of the ground on which the machine stands or moves to be checked, and work not to begin without being sure of its firmness and, where necessary, without stabilising the machine; measures are taken against ground and machine slippage at trench edges and on steep slopes (Annex 4/B, Part II, Art. 51). Protective measures are also taken to prevent machines from falling into excavations or water (Art. 55).
On site, these provisions translate into the following rules:
- Approaching the excavation edge: The machine does not approach the edge of an excavation closer than the ground can bear. The safe distance is determined by a competent person according to the ground structure and excavation depth, and marked on site. For the risks on the excavation side, see our article on excavation and trench collapse measures.
- Working on a slope: When carrying a load on a slope, the bucket is kept low and facing uphill; travelling sideways across the slope is avoided.
- Bucket height: If a loader carries a full bucket high up, the centre of gravity rises and tip-over becomes easier.
- Stabiliser legs: On a backhoe, the stabiliser legs are lowered onto firm ground before digging.
- Cab and seat belt: The part where the driver sits must be constructed so that the driver is not crushed if the machine tips over and is protected from falling objects (Art. 56). This protection only works if the operator keeps the seat belt fastened; an operator who tries to jump out of the cab during a tip-over may end up under the machine.
Blind spots and pedestrian traffic
What construction machinery blind spot accidents have in common is that the operator never saw the pedestrian. The rear of an excavator's rotating upper structure, the bucket and front of a loader, and the area around a backhoe's rear digging arm are typical blind spots. The Regulation sets four clear rules on this:
- Where the operator's field of view is restricted, a trained signaller is appointed to guide the operator (Art. 52).
- Manoeuvring and parking areas and movement zones for machines are defined (Art. 53).
- All manoeuvres are directed by a supervisor; for reversing manoeuvres, audible and visual warnings are kept in working order (Art. 54).
- Only the operator is in the operator's cab (Art. 57).
| Machine | Typical danger zone | Measure |
|---|---|---|
| Excavator | Slewing area of the upper structure, especially the rear | Taping off an area equal to the slewing radius, signaller |
| Loader | Front of the bucket and beneath a raised bucket; reversing | Ban on standing under the bucket, reversing alarm, camera |
| Backhoe | Swing area of the rear digging arm, front bucket | Closing off the arm area during digging, loading with a signaller |
| All machines | Truck loading point | Truck driver stays in the cab or waits in a safe area |
The eye-contact rule is simple but effective: a pedestrian does not enter the machine's working area without making eye contact with the operator and receiving a sign of approval. Cameras and sensors support this rule; they do not replace it.
Contact with underground and overhead lines
Before excavation begins, the locations of underground cables, gas pipes, water, sewerage and other distribution systems are identified and measures are taken to minimise the hazards they may cause (Annex 4/B, Art. 62/b). In practice this is done in the following order:
- Request line information in writing from the relevant electricity, natural gas, water and telecom utility companies.
- Mark the approximate route of the lines on site.
- When approaching a line, dig in a controlled way by hand or by suitable methods, not with the machine.
- If you encounter an unexpected pipe or cable, stop work and inform the relevant company.
If work is to be carried out under or near overhead power lines, the approach distance and, if necessary, de-energisation are agreed in advance with the electricity distribution company. For the general framework of electrical risk, see our article on the five electrical safety rules.
Falls when mounting, dismounting and during maintenance
An inconspicuous but frequent type of construction machinery accident is slipping and falling while getting into or out of the cab. Muddy steps, broken grab handles and jumping down in a hurry are the typical causes. The rules are:
- Three points of contact: When mounting and dismounting, two hands and one foot or two feet and one hand are always in contact with the machine.
- Facing the machine: As on a ladder, descend facing the machine.
- No jumping: Jumping from the last step to the ground causes ankle and knee injuries.
- Clean steps: Steps and grab handles are cleaned of mud and oil at the start of the shift.
There are also two main rules for maintenance and breakdown work: nobody works under a bucket or attachment until it has been lowered to the ground, and no intervention is made until hydraulic pressure has been released and the machine locked. For energy isolation in maintenance work, see our LOTO article.
Construction machinery periodic inspection, operator certificate and health
The construction machinery periodic inspection requirement comes from Annex III of the Regulation on Health and Safety Requirements for the Use of Work Equipment. Under the table renewed by the amendment of 23.12.2025, the periodic inspection interval for construction machinery is at most 1 year; if a standard or the manufacturer's instructions specify a shorter interval, that interval applies. The inspection is carried out by an engineer, technical teacher, technician or higher technician registered on EKİPNET (the Ministry's register of authorised inspection personnel); the contract is made through ISG-KATİP (the Ministry's online OHS registration system) at least one day before the inspection. For details, see our articles on work equipment periodic inspection intervals and how to read a periodic inspection report.
The periodic inspection is done once a year, but the machine works every day. The operator's start-of-shift check should therefore be a separate record:
- Are there leaks or bulges in the hydraulic hoses and connections?
- Are the reversing alarm, lights, mirrors and camera working?
- Is the seat belt intact and is the buckle working?
- Are the bucket pins and quick-coupler lock in place?
- Is there damage to the tyres or tracks?
- If there is a fire extinguisher on the machine, is it in place and usable?
Annex 1 of the vocational training regulation covers ground excavation, cutting and filling work and the use of the vehicles and equipment needed in construction work; in these jobs the operator must hold a vocational training certificate appropriate to the work they do. Operator certificates issued by the MEB (Ministry of National Education) and institutions it authorises are among the valid documents. As an MYK (Vocational Qualifications Authority) certificate may be required in some occupations, also check our article on occupations requiring an MYK certificate. In very hazardous jobs the periodic medical examination is carried out once a year and nobody may start work without a fitness-for-work report; the workplace physician assesses the operator's fitness for this work, which demands good vision, hearing and attention.
In our OHS specialist service we plan machine movement areas, the signaller arrangement and pre-excavation line checks on site; in our periodic inspection service we set up the inspection calendar for construction machinery together with the business. For obligations specific to construction work, see our construction sector page, and for tracking inspection dates, our OHS calendar tool.
Frequently Asked Questions
What is the most critical measure for excavator safety?
There is no single measure, but the two scenarios that most often have fatal outcomes are striking a pedestrian in the slewing area and tip-over. Physically closing off the slewing area, appointing a signaller and making sure the operator keeps the seat belt fastened are the priority measures.
How often is the periodic inspection of construction machinery carried out?
Under Annex III of the Work Equipment Regulation, the maximum interval for construction machinery is 1 year. If the manufacturer's instructions or a standard specify a shorter interval, that interval applies.
Should the operator jump when the machine is tipping over?
No. A cab protected against tip-over only provides protection while the operator is inside with the seat belt fastened. An operator who tries to jump may end up under the overturning machine.
Can excavation start without underground line information?
No. The Regulation on OHS in Construction Work requires the locations of underground cables, gas and water pipes and other distribution systems to be identified, and the necessary measures taken, before excavation begins.
A certified specialist matched to your hazard class: site inspections, approved logbook, training plan, annual plan and report follow-up.
Bursa SİSTEMER OSGB Technical Team — written from the field experience of our OHS specialists and workplace physicians. Legal information is valid as of the publication/update date; contact us for an assessment specific to your business.