Unauthorised Access within Temporary Traffic Management (TTM): Prevention and Response
An unauthorised vehicle entering a worksite is one of the most serious situations a crew can face.
It can happen in seconds and often without warning. A driver may be unfamiliar with the area, distracted by changing traffic conditions, confused by a temporary arrangement, or simply fail to obey the warning and regulatory signs.
That is why the work we do before and during a shift matters so much.
Advance warning signs, regulatory signs, tapers, safety barriers, buffer zones, delineators and safe positioning are all designed to create time and space between traffic and the work crew.
But those controls only work when they are correctly positioned, maintained and actively monitored.
Table of Contents
What Helps Keep Vehicles Out of the Work Site?
Preventing unauthorised access starts with creating a clear and predictable path for approaching road users.
Advance Warning
Advance warning signs give drivers time to recognise that the road environment is changing. Regulatory signs ban movements and/or reduce the speed limit. Correct positioning gives approaching motorists more time to slow down, understand the temporary traffic management and respond before they reach the work site.
If drivers are not seeing or responding to the warning early enough, it is important to raise the concern rather than assume they will adjust.
Tapers and Buffer Zones
Tapers help guide traffic gradually into the required path, while buffer zones provide separation between moving vehicles and the work area.
These spaces are there for a reason. They should not be shortened simply because the site feels tight or there is pressure to create more room for the work.
Clearances/buffer zones between live traffic and workers can make a critical difference if a vehicle does not follow the expected path.
Positioning Matters
Where Traffic Management Implementors (TMIs) and Traffic Controllers (TCs) position themselves and their vehicles can have a major impact on site distances.
Approaching drivers need to be able to see the TMI/TC early enough to respond. Avoid positions where visibility is blocked by parked vehicles, plant, equipment, vegetation, road geometry (blind hills & bends) or other obstructions.
Just as importantly, never position yourself in the path of traffic you are controlling.
Good positioning gives us visibility of approaching vehicles. It allows us to identify approaching errant vehicles. While maintaining a safe distance from moving traffic.
Know Your Escape Path
Every TMI and TC should know where they will move if a vehicle is acting erratically on approach.
Do not wait until a vehicle is already entering the work area to decide where to go. Identify a clear escape path before and during implementation, operation and removal.
Worksites change throughout the day, so escape paths need to be continually identified. Look out for each other and call out poor practice.
Shadow and Buffer Vehicles
Where shadow or buffer vehicles form part of the approved temporary traffic management arrangement, they need to be correctly positioned and visible to approaching traffic.
Arrow boards, beacons and other required warning systems should be checked and kept operational.
These vehicles can provide an additional layer of protection between live traffic and the work area, but they are only effective when they are correctly positioned and maintained.
Watch Oncoming Traffic, Keep Your Head on a ‘Swivel’
It is easy to become focused on what is happening inside the work site. But for a TMI and TC, the approaching traffic is the immediate hazard.
Face traffic whenever possible. Always turn your head and watch your back. Do not trust a TMA to do this for you.
Are vehicles acting erratically?
Are they swerving within their lane?
Are they slowing down?
Are they changing lanes suddenly?
Are they approaching too quickly?
Has a vehicle crossed a line or cone?
Early recognition gives the crew more time to respond.
Know Where You're Going Before You Need to Go
There is no time to stop and work out an escape route once a n errant vehicle has entered the work site.
The decision needs to be made before the situation occurs.
Throughout the implementation, operation and removal, ask yourself:
- Can I see oncoming traffic?
- Where will I move if an errant vehicle approaches?
- Do I have an escape path?
- Can approaching drivers see me and/or the TMIV clearly?
- Are signs, delineators and other devices positioned correctly?
- Is traffic slowing where we expect them to?
- Can we communicate warning to the rest of the team quickly?
- Does everyone understand what action to take if an errant vehicle enters the work area?
These questions help us come home in the same condition we left.
When Conditions Change, Speak Up
Traffic management sites rarely stay exactly the same all day.
Signs may move, work activities may progress, vehicles may be repositioned, traffic volumes can increase and visibility can change.
If something affects the safety of the temporary traffic management arrangement, raise it with your TMI/TL or supervisor so it can be assessed and the appropriate action taken.
Do not ignore a developing problem simply because the setup was correct earlier in the shift.
If an Unauthorised Vehicle Enters the Work Site
If an unauthorised vehicle enters the work site, the immediate priority is to protect people.
Move first, then warn.
Get yourself clear of the vehicle’s path, alert the crew and stop works when it is safe to do so.
Do not attempt to physically stop, block or chase the vehicle.
Incidents should be reported every time, including near misses where nobody was injured and no property was damaged. Stick to the facts and do not fabricate details. It’s okay to state ‘I don’t know’.
Near Misses Matter Too
A vehicle does not need to hit someone for the event to be serious.
A driver crossing a taper, entering a buffer zone or coming close can provide an important warning that something needs attention.
Reporting these events helps teams understand what happened and identify where additional controls, better positioning, improved communication or other changes may be required.
A near miss can be an opportunity to learn before someone gets hurt.
Final Thoughts
We cannot control how every driver behaves, but we can control how well we prepare for unexpected behaviour.
Keeping our heads ‘on a swivel’, creating enough space, maintaining good visibility, keeping traffic control devices correctly positioned and knowing where to move if something goes wrong all help get us home safely.
Unauthorised access prevention is not something that ends once the site is set up. It is something the entire team needs to think about throughout.
Know where you will go before you need to go.
That preparation could make all the difference.
FAQs
What is unauthorised access?
Unauthorised access occurs when a vehicle enters an area that has been established as a protected work zone or crosses temporary traffic management into an area where workers or equipment are present.
What can help prevent vehicle intrusion?
Advance warning, regulatory signs, correctly installed tapers, adequate buffer zones, clear signage, appropriate positioning, suitable vehicle protection and continuous monitoring can all contribute to preventing unauthorised access.
Why is an escape path important?
An escape path gives us a direction to move if an errant vehicle approaches. It should be identified before implementation begins.
What should we do if an errant vehicle approaches?
The immediate priority is to move away from the vehicle’s path, alert the crew and stop works when safe. Do not attempt to stop, block or chase the vehicle. Follow the site’s incident response procedures and notify the appropriate Supervisor.
Should near misses be reported?
Yes. Near misses can identify weaknesses or changing risks in a traffic management setup, even when nobody is injured and no damage occurs.
Why is ongoing monitoring important?
Traffic conditions, work activities, equipment positions and road user behaviour will change through the shift. Ongoing monitoring helps identify developing risks before they become serious incidents.