It's a notorious bottleneck, sometimes leading to a wait of several hours at dangerous altitudes.

Difficulties include the Hillary Step, a 30-foot cliff with fixed rope that is a notorious bottleneck.

LNP pledge to beat notorious bottleneck Opposition leader aims to right traffic wrongs in a bid to win forthcoming election.

Regular travellers from Galway to Dublin will remember Kinnegad with mixed feelings as the most notorious bottleneck of the journey.

The final leg of the €205 million Ennis bypass opened yesterday, ending gridlock at one of the country's most notorious bottlenecks.

One of the State's most notorious bottlenecks is to be significantly eased this week, with the opening of the Enfield relief road in Co Meath.