A letter, written by a Narromine mother and concerned resident, was pinned to the community notice board in Coles at Narromine addressed to the "older residents or other inconsiderate drivers that travel on the highway to Dubbo".

The woman condemned road users who travel at speeds lower than 110 kilometres per hour along the Mitchell Highway between Dubbo and Narromine.

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"If I get stuck behind you, I will take down your number plates and report you to [Transport for NSW] for investigation and you will have to sit another driving test, and may lose your licence," the letter warned.

"You are not being safe and you are being inconsiderate and causing the other drivers that are stuck behind you to get very frustrated and that's when accidents happen.

"So if you can't drive the speed limit, catch the bus into town, because you are going to cause an accident.

"That highway is so dangerous and I don't want any of my family killed. So think about it. If you aren't confident enough to go 110 km/h don't drive, we don't need you on the road.

"I also encourage all other road users who are fed up with these drivers to do the same. Let's keep our roads safe."

However others have hit back at the nameless writer, arguing it was "inconsiderate" and "disrespectful".

Wendy Hood told the Daily Liberal she drives a coach bus regularly on along the Mitchell Highway between Dubbo and Narromine and said there should be no hurry when it comes to driving on the highway.

"Well I drive a coach on that road regularly, and like all heavy vehicles we are limited to 100km/h for safety by law, and I am a senior," she said.

"Even though I run to a timetable, I would rather be held up by a driver driving to their ability, than an inpatient driver driving too close, or dangerously due to frustration."

"If you don't feel safe driving on this road you also have the option of catching the coach to and from Dubbo. Then you can sit back relax and not be frustrated with your world while you are still young, because one day honey, you are going to be a senior. But with your current attitude you might not make it."

While there were comments that supported the notice, a majority of responses argued impatient drivers were more at risk for causing accidents.

Kelly Goodwin from Eumungerie told the Daily Liberal while she understood the frustration in the letter from being a regular driver of the Newell Highway, but people needed to "take a breath" on the roads.

"We don't have the right to tell people not to drive slower than 80km/h, what does she expect learners to do?, They won't get a license if they can't learn," Ms Goodwin said.

"I think people need to take a breath and relax, don't let a slow car annoy you, life is to short to let petty things annoy you."

In 2019 the NSW government committed $18 million in funding for the construction of three additional overtaking lanes on the Mitchell Highway between Dubbo and Narromine.

Work was expected to begin on the highway in April 2020.

Mick Edwards commented on the initial story saying the overtaking lanes would be an advantage easing traffic flow between Narromine and Dubbo, but everyone should take responsibly and share the road.

"More overtaking lanes are to be built soon which will be a huge advantage on that road which is usually too busy to be able to overtake anywhere," Mick Edwards told the Daily Liberal.

"Slow vehicles are an issue with traffic flow, but that's part of sharing the road especially in rural areas where there's agricultural plant, road trains, caravans, elderly folk still driving due to inept public transport networks."