8.3 Mobile Plant, Construction Vehicles & Cranes (CR 22, 23)

1. Statutory Governance of Construction Vehicles and Mobile Plant (CR 23)

Mobile construction machinery—including excavators, articulated dump trucks (ADTs), front-end loaders, motor graders, bulldozers, and concrete mixer trucks—constitutes a leading cause of severe trauma and occupational fatalities on civil and building sites. Crushing incidents involving ground personnel, vehicle rollovers on haul road embankments, brake failures on steep declines, and reversing collisions into workers are persistent hazards.

To control these risks, Construction Regulation 23 establishes comprehensive statutory mandates governing the design, mechanical integrity, traffic coordination, and operation of construction vehicles and mobile plant.

2. The Comprehensive Site Traffic Management Plan (TMP)

Under Construction Regulation 23, construction vehicles and mobile plant must be used as designed and properly organised and controlled with signalling or other arrangements (CR 23(1)(c) and (f)), and every site must be organised so that, as far as reasonably practicable, pedestrians and vehicles can move safely on suitable, signed traffic routes (CR 23(2)(b)–(d)). On a high-risk construction site, administrative safety signs alone are wholly inadequate. The Construction Health and Safety Manager (CHSM) must ensure the site develops, implements, and audits a comprehensive Site Traffic Management Plan (TMP) founded on the principle of engineered physical segregation:

• Pedestrian-Vehicle Physical Separation: Pedestrian walkways must be entirely segregated from heavy vehicle haul routes using rigid physical barriers, such as precast concrete New Jersey barriers or heavy-duty crash guardrails. Plastic boundary chain or loose netting does not provide mechanical deflection capability and is strictly prohibited along primary haul corridors.
• One-Way Haul Road Configurations: Wherever site topography and boundaries allow, haul roads must be designed in continuous one-way loop systems. Eliminating two-way traffic eliminates head-on collision risks and drastically reduces the need for heavy trucks to execute blind, three-point reversing turns in congested laydown yards.
• Speed Management and Sightlines: Site speed limits must be strictly established (maximum $10\text{ to }15\text{ km/h}$ within congested building footprints, and $20\text{ to }30\text{ km/h}$ on long, open arterial haul roads). Speed humps, illuminated signage, convex traffic mirrors at blind corners, and maintained clear sightlines at intersections are mandatory.
• Vehicle Access Control and Marshals (Banksmen): Designated traffic marshals wearing high-visibility Class 3 reflective vests and equipped with high-visibility batons and two-way radios must manage every vehicle gate, materials delivery zone, and pedestrian crossing.

3. Engineering Safety Systems for Construction Plant

CR 23(1) requires all construction vehicles and mobile plant to be of acceptable design and construction and maintained in good working order, with the following safety features:

• Rollover and Falling-Object Protection (CR 23(1)(h)): Structures designed to protect the operator from falling material and from being crushed if the machine overturns, such as a rollover protective structure (ROPS) to ISO 3471. In a catastrophic slope rollover, ROPS prevents the cab from collapsing and crushing the operator inside the survival zone.
• Falling Object Protective Structures (FOPS): Structural overhead cab armor certified to SANS / ISO 3449, designed to resist impact penetration from falling boulders, excavator bucket spillage, or dropped building materials.
• Operator Restraints: Seatbelts, which the manufacturer fits with ROPS and client specifications require to be worn (CR 23(1) does not mention seatbelts expressly, but a ROPS only protects a belted operator). In rollover incidents, an unbelted operator is invariably ejected through cab windows and crushed beneath the machine's own ROPS frame. A strict site policy of "No Seatbelt, No Ignition" must be enforced.
• Auditory and Visual Warning Systems: CR 23(1)(i) requires an acoustic warning device the operator can activate, and CR 23(1)(j) an automatic acoustic reversing alarm. Broadband ("white-noise") alarms are often specified because they are easier to locate. High-intensity flashing amber LED strobe beacons must operate continuously whenever the vehicle engine is running.
• Visibility Enhancements: Side-view and rear-view convex mirrors, supplemented by 360-degree camera systems and ultrasonic radar proximity sensors that alert the operator in real time when ground workers enter rear blind zones.
• Daily Pre-Use Inspections (CR 23(1)(k)): The authorised operator or driver must inspect the vehicle or plant daily before use against a relevant checklist and record the findings in a register kept in the vehicle or plant. The checklist must interrogate: service brakes, emergency parking brakes, steering responsiveness, hydraulic hoses and ram seals (checking for leaks), tire pressures and tread integrity, lights, indicators, horn, reversing alarm, beacon, windshield visibility, and fire extinguisher charge. Operating any machine with defective brakes or steering constitutes a critical safety breach requiring immediate plant lock-out and tagging.

4. Operator Competency and Medical Surveillance (CR 7(8), CR 23(1)(d))

No person may operate mobile construction plant without verified, statutory competence:

1. Competence and Authorisation (CR 23(1)(d)(i)): Operators of construction vehicles and mobile plant must have received appropriate training, be certified competent, hold proof of competency, and be authorised in writing to operate that vehicle or plant. Lifting machine operators must also be trained for the particular type of machine (Driven Machinery Regulation 18(11)), through an accredited training provider. Certificates are machine-specific, so check that the certificate matches the machine.
2. Medical Certificate of Fitness (CR 23(1)(d)(ii) and CR 7(8)): Operators must hold a medical certificate of fitness to operate that vehicle or plant, issued by an occupational health practitioner in the form of Annexure 3 (tower crane operators likewise under CR 22(f)). The practitioner typically evaluates:
   • Cardiovascular stability (hypertension, ischemic heart disease risks);
   • Visual acuity, peripheral field of vision, and depth perception (stereoscopic vision);
   • Audiometric hearing thresholds;
   • Neurological function, testing for epilepsy, uncontrolled diabetes, or conditions causing sudden loss of consciousness;
   • Urine toxicology and blood alcohol screening (reinforcing the zero-tolerance intoxicant mandate of General Safety Regulation 2A). The certificate shows its own expiry date (commonly 12 months) and is filed in the site health and safety file.

5. Cranes, Lifting Machinery, and Statutory Testing (CR 22 & DMR 18)

Lifting operations involving tower cranes, mobile all-terrain cranes, crawler cranes, truck-mounted knuckle-boom loaders (HIABs), and telehandlers represent severe catastrophic risk exposures. Lifting equipment is governed mainly by Driven Machinery Regulation 18 (DMR 18). Construction Regulation 22 (Cranes) adds, for tower cranes, that they be designed and erected under a competent person's supervision, that a risk assessment and method statement be developed and applied, that wind effects be considered and a wind speed device give the operator an audible warning above the design engineer's limit, that bases and rails be firm, level and secured, and that operators be competent and hold an Annexure 3 medical certificate.

Statutory Inspection and Proof Load Testing Schedules

DMR 18 establishes strict legal intervals for examining and testing all lifting machines:

• Thorough Examination and Performance Test (DMR 18(5)): Every lifting machine must be thoroughly examined and performance-tested by a lifting machinery inspector of a lifting machinery entity before first use, every time it is dismantled and re-erected, and at intervals not exceeding 12 months; where no manufacturing standard applies, the whole installation is tested with 110% of the safe working load. Mobile cranes, self-erecting cranes and MEWPs need not be re-tested after each redeployment within that 12-month period. The examination inspects structural welds, chassis integrity, hydraulic circuits, slew rings, hoist cables, sheaves, brakes, limit switches, and the automatic safe load indicator (SLI / LMI).
• Ropes, Chains, Hooks and Safety Devices: DMR 18 also requires the ropes, chains, hooks, attaching devices, sheaves, brakes and safety devices of a lifting machine to be thoroughly examined at shorter intervals (not exceeding 6 months), and a new examination is needed after major repairs or modifications.
• Who May Examine: The DMR 18(5) examination and performance test must be done by a lifting machinery inspector (registered with ECSA) working for a lifting machinery entity registered with the Department, not by the user's own safety officer or mechanic.
• Records: Keep the examination certificates, load charts and daily pre-use records for every lifting machine on site, filed in the health and safety file.

6. Lifting Tackle Management and Discard Criteria (DMR 18(10))

Lifting tackle—defined as synthetic webbing slings, steel wire rope slings, alloy chain slings, bow and Dee shackles, eyebolts, swivel hooks, and spreader beams—couples the crane hook to the payload. Failure of tackle drops the load instantaneously.

• Three-Monthly Examination: Under DMR 18(10)(e), lifting tackle in use must be examined at intervals not exceeding 3 months by a competent person appointed in writing by the user, who records and signs the results in a lifting tackle register.
• Safe Working Load (SWL) Markings: Every sling, shackle, and spreader beam must be indelibly marked with its Safe Working Load (SWL) or Working Load Limit (WLL) and a unique serialized traceability number. Unmarked or illegible tackle must be withdrawn from use.
• Color-Coding System: Sites must enforce a quarterly or semi-annual color-coding regime (e.g., Q1 Green, Q2 Blue, Q3 Yellow, Q4 Orange). Slings that pass inspection are tagged with the active color band. Any tackle bearing an expired or missing color tag must be seized and quarantined immediately.
• Rejection / Discard Criteria:
  • Synthetic Webbing Slings: Immediate destruction if there are visible cuts, tears, broken stitching, acid/caustic chemical attack, heat scorching, or missing WLL tags.
  • Steel Wire Rope Slings: Discard if there are 10 or more randomly distributed broken wires across a length equal to 10 rope diameters, localized core collapse, bird-caging, kinking, severe corrosion, or broken end-fitting crimps.
  • Chain Slings: Discard if any link exhibits elongation/stretch exceeding 5% of original pitch, diameter reduction exceeding 10% from abrasive wear, cracks, gouges, or heat deformation.
  • Bow Shackles: Discard if the body or pin is bent, twisted, modified with non-original bolts, or has worn by more than 10% of original diameter.

7. Rigging Studies, Lift Plans, and Critical Lifts

All crane operations must be categorized into routine lifts or complex/critical lifts:

• Routine Lifts: Repetitive, basic lifts utilizing certified rigging configurations well within the crane's standard rated chart (below 75% capacity), over open, unoccupied ground with direct line of sight. Governed by a standard Safe Work Procedure (SWP).
• Critical Lifts (Engineering Lift Plan Mandatory): A formal written Engineered Lift Plan and detailed Rigging Study must be developed, calculated, and signed off by a competent rigging engineer and the CHSM before executing any lift meeting any of the following triggers:
  1. The load exceeds 75% of the crane's rated capacity at the maximum required operating radius;
  2. Tandem or Multi-Crane Lifts: Two or more cranes lifting a single shared load (requiring crane de-rating by a minimum of $20\%\text{ to }25\%$ to accommodate dynamic load transfer);
  3. Blind Lifts: Operations where the crane operator cannot visually observe the load or the landing zone at all times;
  4. Lifts over active operational facilities, live petrochemical process lines, public roads, or occupied buildings;
  5. Lifts conducted in proximity to overhead high-voltage powerlines;
  6. Lifting people in a crane-suspended work platform, which is permitted only with equipment designed for the purpose and as the Driven Machinery Regulations allow;
  7. Lifts involving non-standard, custom-engineered spreader frames or complex centers of gravity.

Key Engineering Elements of the Lift Plan

• Gross Load Calculation: Net payload mass + hook block mass + headache ball mass + all lifting tackle mass + hoist rope payout mass beyond boom tip.
• Crane Configuration: Outrigger spread, counterweight tray ballast, boom length, boom angle, operating radius, and resulting net available chart capacity.
• Outrigger Pad Ground Bearing Pressure: The massive concentrated loads transferred through crane outriggers must be calculated ($P_{\text{outrigger}} = \text{Total Gross Mass} / \text{Pad Area}$). Outrigger steel or hardwood timber spreader mats must be sized to ensure ground bearing pressure does not exceed the geotechnical ground bearing capacity of the soil.
• Overhead Electrical Clearances: Keep the safety clearances from overhead lines required by the Electrical Machinery Regulations and the line owner (Eskom or the municipality); clearances increase with voltage, so obtain the owner's written safe distance for each line and allow for boom swing, load sway and conductor sag. Erect goalposts with height limiters on travel routes under lines.

8. Banksman Signaller Duties and Wind Speed Limits

• The Appointed Banksman / Rigger: Crane operators must take movement instructions exclusively from one designated, qualified Banksman/Signaller. The Banksman must be clearly identifiable (wearing an orange high-visibility vest distinct from other site personnel) and use an agreed, standard set of hand signals or dedicated two-way radio communication operating on a clear, interference-free channel. In an emergency, any person on site may give the universal "Emergency Stop" signal, which the operator must obey immediately.
• Environmental Operating Limits (Wind Speeds): Cranes are highly sensitive to lateral wind forces on booms and payloads. Every crane must feature a calibrated digital anemometer installed at the boom tip with an in-cab display. Lifting operations must cease immediately when wind gusts reach the manufacturer's maximum safe operating limit (standard threshold is typically 38 to 45 km/h (10.5 to 12.5 m/s), reduced to $25\text{ km/h}$ when lifting large surface area panels such as formwork or cladding). Tower cranes must be placed into free-slew ("weathervaning") mode when de-energized to prevent structural tower collapse.