What Drivers Must Do at Stop/Slow: The Road Rules Explained

The stop slow road rules for drivers are simple: when a traffic controller shows STOP, you stop at the stop line or sign and wait; when they show SLOW, you proceed with care at the signed work zone speed. Controllers' directions are legally enforceable, and normal rules on phones and overtaking still apply in the queue.

That is the summary. This guide explains what each part means in practice, why the rules exist, and what to do in the less obvious situations: long queues, emergency vehicles, cyclists and stop/slow on a crest. It is written for everyday drivers and for site managers who want to explain the rules to their own delivery drivers. Each state and territory has its own road rules based on the Australian Road Rules, and penalties vary, so check your state's current road rules for the exact wording. In NSW that is through Transport for NSW; in Queensland, Transport and Main Roads.

What the STOP and SLOW signs mean

Stop/slow is used where one lane has to carry traffic in both directions, one way at a time. A traffic controller at each end, or a portable traffic light, lets one direction through, stops it, then releases the other.

A controller's hand signals support the sign. A raised palm towards you means stop. A wave means move off. An up-and-down movement of the arm means slow down further.

Where to stop and how to wait

Stop at the stop line or STOP HERE WHEN DIRECTED sign if there is one. If there is no sign or line, stop back from the controller so they can see you clearly and you are not in their path or the work area.

While you wait:

• stay in your lane and in the queue, and keep a gap to the vehicle in front
• keep your eyes on the controller, not your phone, so you see the signal to go
• do not edge forward towards the controller, it crowds their position
• leave room for workers and machines that need to cross

If you are first in the queue, your stopping position matters most. Stopping too close forces the controller to step back towards the work area. Stopping too far back can mean the next driver does not realise traffic is stopped.

Going through on SLOW

When the controller turns the sign to SLOW and signals you on, move off smoothly. Then:

1. Drive at or below the signed work zone speed limit. These limits are enforceable while the signs are displayed, even if you cannot see anyone working.
2. Stay in the open lane, following cones and delineation.
3. Follow the vehicle ahead, and don't stop in the work area unless directed.
4. Watch for workers, plant and loose surfaces. A freshly sealed road can throw stones.
5. Do not overtake in the work zone.
6. Expect a controller at the far end and pass them at low speed.

On longer sites, a pilot vehicle may lead the line through. Stay behind it and do not overtake it.

Example scenario: stop/slow over a rural crest

Here is how this plays out on a typical job. A two-lane rural road with a normal limit of 100 km/h has a resurfacing crew working in one lane near a crest. The traffic guidance scheme shows a reduced speed limit on the approach, advance signs, and a controller at each end of the site.

You are driving at the normal limit. Here is the sequence a careful driver follows:

1. First sign: roadwork speed limit and ROADWORK AHEAD. You slow to the signed speed. If you see an 80 km/h then a 60 km/h sign, you reduce at each.
2. TRAFFIC CONTROLLER AHEAD and PREPARE TO STOP. You check your mirrors. A truck is behind you. You brake early and gently so the truck has time to slow too.
3. A queue of four cars is stopped just over the crest. Because you slowed at the first signs, you stop safely behind it. A driver who ignores the signs arrives at speed and has very little room. This is why the end of a queue near a crest is one of the most dangerous places at roadworks.
4. You wait. Phone stays down. You can see the controller ahead.
5. The controller turns the bat to SLOW and waves. You move off with the queue and stay at the signed speed past the crew and the fresh seal.
6. At the far end, you pass the other controller and resume the normal speed only after the end-of-roadwork sign.

The arithmetic shows why the advance signs matter. As an example calculation, at 100 km/h a car travels about 27.8 metres every second. With a 1.5-second reaction time, you travel around 42 metres before you even touch the brake. On a dry road with a typical hard stop, braking from 100 km/h takes another 50 metres or more, depending on tyres, road surface and the car. That is close to 100 metres in total, more than a short sight line over a crest. Try your own numbers in the free stopping distance calculator.

Speed limits, phones, overtaking and other rules that still apply

Roadworks do not suspend the road rules. They add to them. Drivers often get caught on these points:

• Roadwork speed limits are enforceable, and some states use speed cameras in work zones. Our guide to work zone speed limits in NSW explains how temporary speed zones work there. Other states differ.
• Mobile phones. In most states, being stopped in a queue does not count as being parked, so the usual phone rules still apply.
• Overtaking through a work zone or a stop/slow queue is dangerous and may break the road rules or the lane markings in force.
• U-turns and driving around the queue. Do not turn around in the queue unless it is legal and safe and the controller has not told you otherwise. Never drive on the wrong side or the shoulder to get around a controller.
• Seatbelts must still be worn, even while stopped.

Emergency vehicles, cyclists and pedestrians at stop/slow

Emergency vehicles. If you hear sirens, stay where you are unless the controller directs you. Controllers coordinate by radio to clear a path, which may mean holding both directions. Our guide on letting an ambulance through stop/slow shows the sequence from the controller's side.

Cyclists. Cyclists follow the same STOP and SLOW directions. If you are driving, do not squeeze past a cyclist in the single open lane. Wait behind them.

Pedestrians. Footpath users may be directed across or around the work area. Wait for them to clear before moving off.

Why drivers should respect the controller

Traffic controllers stand close to moving traffic for hours. Abuse, ignored directions and vehicles driving through are recurring hazards in the industry. A controller holding you is not being unhelpful; they are waiting for the last car from the other end, a truck reversing out of the work area, or a worker crossing. Most stops are shorter than they feel.

If you think something is wrong with the set-up, such as an unreasonable delay or a sign you could not see, note the location and time and contact the road authority, the council or the company named on site signs. Do not argue with the controller. Our guide on handling angry drivers at stop/slow shows how controllers are trained to respond.

A quick briefing card for delivery and site drivers

Site managers can print this and hand it to truck drivers, concrete agitator drivers and subcontractors who will pass through their own stop/slow:

• Slow to the signed speed at the first roadwork sign, not at the controller.
• Brake early on PREPARE TO STOP, especially in a loaded truck.
• Stop at the STOP HERE WHEN DIRECTED sign and wait for the controller's signal.
• Never enter or leave the work area without a controller or spotter directing you.
• Never follow another vehicle through after the sign turns to STOP.
• Phone down, windows down if you need to hear instructions.
• Tell the controller by radio or hand signal if you need to turn into the site.

Next steps

Slow down at the first roadwork sign, stop where you are told, and keep your phone down in the queue. For the exact rules and penalties, check your state's road rules through Transport for NSW, your state's road authority or the Australian Road Rules. If you manage a site, share this with your delivery drivers so they know what to expect at your stop/slow. For how the method works from the crew's side, read stop/slow traffic control.