Tractors are always a regular sight on motorways during the summer months.
In recent weeks the agricultural vehicles can be seen carrying trailers of hay and silage bales or pulling slurry spreaders or other heavy machinery.
Ireland is one of the few countries where motorways allow tractors.
Farmers' groups argue that tractors that are road worthy and are taxed and insured have an equal right as other vehicles to be on motorways.
The Road Safety Authority (RSA) said tractors can be legally driven on a motorway in Ireland, providing that the vehicle is capable of reaching a minimum speed of 50km/h.
However one KildareNow reader said tractors seen across Co Kildare on the M4, M7 and M9 may be travelling at a lower speed, as they may be older models or are towing a large load.
He added: "They also slow down going up inclines, especially if they have a heavy load.
"As a result, tractors can result in holding up traffic in the left lane."
"It became mandatory from January 2016 for every tractor to have a hazard warning light on it when it is being used on public roads, irrespective of its age or size - but not every tractor has this light."
Verona Murphy, president of the Irish Road Hauliers Association, told the Joint Oireachtas Committee on Transport, Tourism and Sport last year that Ireland is the only country in the EU that allows tractors on motorways.
She said: “They can be driven on motorways in the Republic of Ireland, providing that the tractor is capable of reaching a minimum speed of 50 km/h.
“In fog or inclement weather conditions, coming upon a vehicle of this nature while driving a HGV capable of a speed of 80 km/h, not to mention a car allowed to travel at 120 km/h, is one’s worst nightmare.
“There have been many incidents of late involving tractors on motorways with near-fatal and, in some cases, fatal consequences.
“In Ireland, there is no requirement to undergo formal training to drive such vehicles and the age of the relevant driver leaves a lot to be desired. This practice must be stopped, with no exceptions, if we are serious about road safety."
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