Motorists in a West Australian farming region say a road tragedy involving a truck and a cyclist is inevitable.

As harvest in the Geraldton region moves into top gear, more trucks are on local roads commuting from farms to the Geraldton Port.

A growing number of recreational cyclists also use the roads.

With the additional truck traffic joining cars and trucks that use roads year round, road users say it is a dangerous situation.

Peter Burton runs a cattle operation at Naraling, about 55 kilometres north-east of Geraldton.

He frequently transports cattle and said cyclists should not be on haulage routes, particularly during busy times of the year.

"Inevitably it's going to be a tragedy, we've got grain trucks on the road, both loaded and empty, they'd be well up to the 90 tonne plus, they're in a hurry to get crop into the bins and deliver it, and these bloody peanuts that want to get exercise are riding pushbikes and think they're going to compete with trucks," he said.

"The concern is you'll get two trucks coming together on a rise or whatever and they've got to pull up.

"It's a statistic waiting to happen."

Mr Burton said he recently had a near miss and this, along with frustration expressed to him by other truck drivers, had prompted him to speak out.

"It's more critical at this time of year because of the numbers of trucks on the road," he said.

"They're not tall, they're not visual, you come over a rise and you're doing well within the speed limit, it's split seconds and you've got to start making some decisions, and if you're loaded with cattle or grain ... trying to pull up 100 tonnes in a hurry, it just doesn't work that way."

Some of the roads Mr Burton is concerned about fall within the Shire of Chapman Valley.

Cyclists should stay off road during harvest: shire president

His concern is shared by shire president John Collingwood.

Mr Collingwood said over the years the shire had received a number of complaints about cyclists on shire roads, and he urged cyclists to consider their safety.

"I know they believe they have a right to do whatever they want to do on the roads, but they are the weakest link on the road," he said.

He said the shire was unable to force cyclists from travelling on roads during busy times of the year.

"I would just hope that the cyclists decide to stay off the road during the main harvest period," he said.

Acting road safety commissioner Kim Papalia said about 25 per cent of the state's population rode a bike at least once a week.

"The risk though is as a cyclist, you need to be conscious that you're sharing space with all other road users and you are a vulnerable road user," he said.

"As a vulnerable road user, you need to be conscious about your situation, your environment and aware of what's going on around you.

"That's also in the decision to plan your route."

Reduce speed limit by 30kph: cycling club

But Spokes Cycle Club member Jennie Haste said while riders tried to avoid the area during busy periods, they believed it was an essential cycling route.

Ms Haste said speed limits along the roads should be reduced by up to 30 kilometres per hour, to help make the area safer for all road users.

"Cyclists are legally allowed on the roads and I believe that the speed limit should be reduced, I think that's where the problem lies," she said.

"If you've got more time to stop and overtake ... I mean you do it in school zones don't you, why can't cyclists have the same types of preservation and share the road?"

Ms Haste said inexperienced truck drivers also need better education.

"We find at harvest time, there are drivers on the road that are not experienced," she said.

"I think that is partly where the trouble arises.

"To take an extra few seconds to overtake a cyclist safely is not going to make a huge difference to whether there's going to be an extra load to the port that day."

Ms Haste said cycling was gaining popularity in Geraldton and the cycling community wanted to find a solution which worked for all users.