Almost a third of motorcyclists killed between 2008 and 2012 had consumed alcohol, according to a study carried out by the Road Safety Authority.
During that five-year period 983 fatal collisions occurred on Irish roads, claiming the lives of 1,077 people.
Of 867 fatal collisions analysed, 93 involved a motorcyclist and the study found that speed was a factor in almost half of the motorbike crashes.
The study also found that in almost one-third of the crashes, the motorcyclist had consumed alcohol and almost half of these were four-times or more above the legal limit.
The analysis also showed that 57% of the motorcyclists in fatal collisions who had consumed alcohol crashed on a Sunday between 5pm and 6pm.
Of the 93 fatal collisions involving a motorbike, the motorcyclist was deemed culpable in 72 collisions and part-culpable in eight crashes.
The data shows the seasonal nature of the crashes, with April and July the most dangerous months of the year for motorcyclists.
The findings were published today to mark the beginning of Road Safety Awareness Week.
To date this year 140 people have been killed on Irish roads, 22 more than the same period last year.
RSA Chief Executive Moyagh Murdock has expressed concern at the worrying trend in motorcyclist deaths.
She said it is critical that motorcyclists recognise their vulnerability on the roads and take appropriate measures to ensure their safety.
When asked about the threatened Garda industrial action, Ms Murdock said she was concerned, given the job the gardaí and in particular the Garda Traffic Corps do, in policing the roads.
She also said she was worried more lives would be lost on the roads in the run-up to Christmas.
In June a study by the RSA found alcohol was a factor in almost 40% of all fatal road incidents.
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