Every day, motorists travelling along Christchurch’s Southern Motorway encounter a frustrating and potentially dangerous situation: vehicles occupying the right-hand lane for extended periods without actively overtaking other traffic. Despite the purpose of this lane being to facilitate overtaking where the road rules require drivers to keep left, many motorists continue cruising in the right-hand lane, often travelling at or below the speed limit while leaving the left lane available. This behaviour creates unnecessary congestion, disrupts the natural flow of traffic, and increases the risk of dangerous driving manoeuvres.

The issue is particularly concerning when it comes to heavy vehicles. Trucks in New Zealand are generally subject to a maximum speed limit of 90 km/h, unless a lower limit applies. When cars remain in the right-hand lane without overtaking, truck drivers and other motorists can find themselves caught behind slower-moving traffic with limited opportunities to pass safely. This can result in long queues, frustrated drivers, sudden lane changes, and increased pressure on motorists to undertake or make other risky manoeuvres to get around vehicles that are not using the motorway lanes appropriately.

A motorway should be designed and used to keep traffic moving safely and efficiently. When drivers unnecessarily occupy the right-hand lane, they undermine this purpose and create avoidable problems for everyone sharing the road. Whether someone is commuting to work, transporting goods, travelling with family, or simply passing through Christchurch, every road user deserves a motorway environment where traffic can flow predictably and safely.

New Zealand’s road rules establish requirements for keeping left and using the right-hand lane appropriately on roads with multiple lanes travelling in the same direction. On motorways and other roads where the keep-left rule applies, drivers should generally remain in the left lane unless they are overtaking, turning right, avoiding an obstruction, or another permitted circumstance applies. Drivers must also obey applicable speed limits and drive in a manner that is safe and lawful.

Unfortunately, many motorists appear either unaware of these requirements or unwilling to follow them consistently. Some drivers seem to believe that travelling at the posted speed limit gives them the right to remain in the right-hand lane indefinitely. However, travelling at the speed limit does not automatically exempt a driver from applicable keep-left requirements. The purpose of the overtaking lane is to allow traffic to pass slower vehicles safely, not to become a permanent cruising lane.

This misunderstanding can have consequences beyond simple inconvenience. When the right-hand lane is occupied unnecessarily, faster-moving traffic can become trapped behind vehicles that are not overtaking. Drivers may then become impatient, follow too closely, brake unexpectedly, or make abrupt lane changes in an attempt to get past. These behaviours can increase the likelihood of collisions and create additional hazards, particularly during peak commuting periods, in wet weather, or when traffic volumes are high.

The impact on heavy vehicles deserves special attention. Trucks play an essential role in transporting goods throughout Canterbury and across New Zealand. Their size, weight, braking distances, and restricted manoeuvrability mean that they require predictable traffic conditions and sufficient space to operate safely.

With a maximum speed limit of 90 km/h generally applying to heavy motor vehicles, truck drivers may encounter situations where slower traffic occupies the right-hand lane and prevents them from making progress when a safe and lawful passing opportunity exists. Although trucks must always comply with their applicable speed limits and other road rules, they should not have to contend with unnecessary lane obstruction that makes ordinary motorway travel more difficult.

Keeping left appropriately helps create a more predictable environment for heavy vehicles and passenger cars alike. It can reduce unnecessary bunching, discourage risky passing manoeuvres, and make it easier for drivers to anticipate the movements of surrounding traffic. Better lane discipline benefits not just truck drivers but every motorist travelling along Christchurch’s Southern Motorway.

One practical and cost-effective step towards addressing this problem is the installation of prominent “Keep Left Unless Passing” signs at suitable locations along Christchurch’s Southern Motorway.

Clear signage would provide a regular reminder of the expected driving behaviour and help motorists understand that lane discipline is an important part of safe motorway travel. While many experienced drivers may already know the rules, others may not fully understand when they are expected to keep left. Repeated, strategically placed signs could help close this knowledge gap and encourage drivers to make better decisions before congestion develops.

Signs could be installed at motorway entry points and at suitable intervals along relevant stretches of road, particularly where right-lane cruising is frequently observed. Their placement should be assessed by the responsible transport authorities to ensure they are visible, appropriately spaced, and consistent with New Zealand road-signage standards.

Importantly, signage would not be intended to encourage speeding or aggressive driving. The message is simple: drivers should obey the speed limit, maintain a safe following distance, and use the right-hand lane appropriately. Keeping left does not mean that motorists should exceed the speed limit to pass another vehicle. It means that drivers should follow the applicable lane-use rules while making safe and lawful decisions.

In addition to installing signs, authorities could consider public awareness campaigns, targeted enforcement, and periodic reviews of traffic conditions. Combining education with appropriate enforcement would help ensure that the message is understood and that existing road rules are taken seriously.

The benefits of improved lane discipline could extend well beyond reducing driver frustration. More consistent compliance with keep-left requirements can help traffic move more predictably, reduce unnecessary lane changes, and improve the overall driving experience.

For commuters, this could mean fewer avoidable bottlenecks and less time spent behind vehicles occupying the right-hand lane unnecessarily. For commercial drivers, it could mean fewer situations where traffic bunches up and safe passing opportunities become difficult to find. For families and other road users, it could contribute to a calmer and more predictable motorway environment.

Although signs alone cannot eliminate every instance of poor driving, they are a straightforward intervention that could reinforce existing rules and complement other road-safety measures. The cost of installing appropriate signage should also be considered against the potential benefits of improved driver awareness, more orderly traffic movement, and fewer dangerous interactions between vehicles.

Rather than waiting for poor lane discipline to contribute to a serious incident, the relevant authorities have an opportunity to take proactive steps now. A visible reminder can help establish clear expectations and encourage motorists to take greater responsibility for how they use the road.

Christchurch’s Southern Motorway is an important transport route for commuters, families, businesses, and freight operators throughout the region. Everyone who uses it has a shared responsibility to follow the road rules and help maintain a safe, efficient flow of traffic.

The continued misuse of the right-hand lane is an issue that deserves attention. Drivers who occupy this lane unnecessarily can contribute to congestion, frustration, and potentially hazardous driving situations. Clearer signage would be a practical way to remind motorists of their obligations and reinforce the importance of considerate, lawful driving.

We therefore call on the relevant transport authorities, including Waka Kotahi NZ Transport Agency and other responsible road-controlling authorities, to investigate the installation of prominent “Keep Left Unless Passing” signs along Christchurch’s Southern Motorway. We also encourage consideration of targeted driver education and appropriate enforcement to support compliance with existing road rules.

Keeping left when required is not simply a matter of courtesy. It is an important part of responsible driving and sharing the road safely. Let us work towards a motorway where the rules are understood, traffic flows more smoothly, and every road user can travel with greater confidence.
A quick note before publishing: I’ve kept the petition persuasive while avoiding presenting the $150 fine and 20 demerit points as definitively current. Please verify the stated penalty and offence code D701 against current New Zealand rules before including them as facts. It would also be worth confirming which authority is responsible for the specific motorway sections you want the petition to cover.
 
 Another thing to point out is when the sun is low on the horizon, drivers travelling towards it can experience severe glare that temporarily reduces visibility and makes it much harder to see vehicles, judge distances, and react to changing traffic conditions. This is particularly dangerous at motorway speeds, where drivers have very little time to respond to sudden braking or unexpected lane changes. When a vehicle unnecessarily occupies the right-hand lane and prevents traffic from passing smoothly, it can create an additional hazard for drivers already struggling with sun glare. Motorists may be forced to slow down suddenly, change lanes with limited visibility, or react to vehicles ahead that they cannot clearly see until the last moment. These conditions make predictable driving and proper lane discipline even more important. Keeping left where required helps reduce unnecessary obstructions and allows traffic to move more consistently, lowering the likelihood of sudden manoeuvres in already challenging conditions. Given the specific early-morning sunstrike risks faced by drivers on Christchurch’s Southern Motorway, clear “Keep Left Unless Passing” signage would be a sensible preventative measure to reinforce safe driving behaviour and help reduce avoidable hazards.