Four motorcyclists were injured in separate crashes during an organised ride through the Waikato on Saturday, prompting police to urge caution as warmer spring weather draws more riders back onto the roads.

In a statement this week, road policing director Superintendent Steve Greally said NZ usually sees an uptick of motorcycles on the roads as the warmer months kick in, and “unfortunately an increase in motorcycle injuries and crashes”.

He said spring often brings inexperienced riders, and people who might have had time off from riding, back onto bikes.

“The consequences of a mistake on a motorbike can be far worse than for other vehicles, which is why we’re urging new and returning riders to take extra care.”

Greally said spring riding can present its own challenges.

Short bouts of rain can make for a combination of wet and dry, and greasy, roads; sunstrike and glare can limit rider vision; and warm temperatures can lead to oil and loose grit on road surfaces.

Police were aware of and monitoring an organised motorcycle run, which went from Whatawhata, through Pirongia, Te Awamutu, Arapuni, Putaruru and north to Huntly on Saturday.

Within around two hours, police were notified of four riders coming off their bikes.

Around 11am, a woman came off her motorbike after hitting gravel on Te Pahu Rd, sustaining a fractured wrist.

Ten minutes later on the same road, a man came off his bike and was knocked unconscious and reported having a sore back.

The man hadn’t ridden in 30 years, police said.

About 12.20pm, another member of the motorcycle run came off his bike on Arapuni Road.

Police said he had been riding in formation, and was pushed on to gravel after going around a slight bend.

He suffered a broken arm.

Around 15 minutes, later another man who was riding two abreast came off his bike on Arapuni Rd – ambulance assistance was declined.

Superintendent Steve Greally, national manager of road policing. Photo / Mark Mitchell

“We all want to be out on the roads when it’s good weather, but it’s important to get the basics right,” said Greally.

“I understand that riding with friends can be a great experience, but it’s not great when the cost is a serious injury or worse.

“We’re reminding riders to take it slow, make sure they’re wearing the right gear and make good decisions.”

New and returning riders are urged to explore resources such as Ride Forever.