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:
Prison Dispute Linked To Fatal Arson Attack In Offaly
BnM Opens New Funding Round For Offaly Community Benefit Fund
Orange Wind Alerts Issued As Storm Bram Approaches
Irish Hauliers Threaten Protests Over Toll Discount Dispute
Former Irish Soccer Legend Backs Offaly Community After Arson Attack
Tributes Paid To Former Fine Gael Midlands Politician
Midlands 103 Launches Joint Christmas Appeal With Simon Community
Offaly Arson Attack Is An Attack On Society Itself - Taoiseach
Woman Facing Life In Prison After Double Midlands Murder
Housing Committee Chair Flags Cost Concerns Over Apartment Fire Safety Scheme
Justice Minister Wants People To Come Forward Over Offaly Arson Attack
New Report Warns Of “Poor Liquidity” As Ireland’s Housing Market Stalls
Laois TD Renews Calls For Updated Wind Farm Guidelines
Midlands Man Laid To Rest Today
Anti-Racism Funding Granted For Offaly And Westmeath Groups
Gardaí Begin Murder Investigation After Child And Woman Dies In Offaly House Fire
Ashling Murphy Murder "Wrongly Accused" Granted Bail Over Theft Charge
Young Boy And Woman Killed In Offaly House Fire
Laois Makeup Artist Warns Of Expired Suncream Dangers
Lynx and Wolves In Ireland Pose Minimal Threat - Offaly Biodiversity