Funding for an upgrade of the road was shelved last year.
There have been 20 fatalities and over 30 serious crashes, as well as over 200 other collisions on a midlands road since 2008.
Longford Westmeath TD Joe Flaherty revealed the figures during an "impassioned plea" to the Transport Minister to re-instate funding for the long-awaited N4 Mullingar to Roosky upgrade.
The 52km stretch of road has been the subject of a number of campaigns from local representatives since funding for the project was shelved early last year.
But, Transport Minister Eamon Ryan says he can't promise the funding will be in place during this government's lifetime:
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