A cycle lane has been introduced on the right-hand side of the North Quays.
Dublin City Council said yesterday that it was part of the interim Liffey Cycle Route scheme, which is being developed as one of its overall 470km of safer cycling routes.
"Cyclists now get an advanced green light at junctions. Car drivers turning right need to give way to cyclists going straight," the council said.
Giving its reaction, Dublin Commuter Coalition, which advocates on behalf of cyclists, pedestrians and public transport users, said: "Remember drivers: this may seem like an inconvenience, but these cyclists are doing you a favour.
"If they all drove, you'd be in much worse traffic than this."
A spokesman for the group welcomed the new lane, saying: "We need to give more space to cyclists and pedestrians. There is no other way."
He added there was an issue with cars driving faster because there were fewer cars around.
"It's basically like night-time driving all day. Road deaths haven't gone down, they have gone up," he said.
Meanwhile, gardai are to conduct a national speed enforcement operation - Slow Down - supported by the Road Safety Authority (RSA) for 24 hours today, beginning at 7am.
Its aim is to remind drivers of the dangers of speeding, to increase compliance with speed limits and act as a deterrent to driving at excessive or inappropriate speed.
The operation will consist of high-visibility speed enforcement in 1,322 zones.
"National Slow Down day is about making our roads and our communities safer," said Chief Superintendent Paul Cleary, of the Roads Policing Bureau.
"During the current Covid-19 restrictions we have seen an increase in the number of vulnerable users on our roads.
"Excessive or inappropriate speed contributes to serious injuries and fatalities.
"Despite reduced volumes of traffic on our roads, the levels of speed have increased. Whilst the vast majority of drivers drive safely within the speed limits, and it is most welcome, there still remain those who continue to drive at excessive speeds. We will maintain our focus on non-compliant drivers as they pose a risk to themselves and other road users."
The RSA's interim chief executive John Caulfield said: "Even though traffic volumes have reduced, the need for drivers to slow down has never been greater.
"Anyone out driving will probably encounter large numbers of people out walking, jogging and cycling within five kilometres of their homes.
"Vulnerable road users will probably need to social distance too when sharing the road."
Meanwhile, the number of deaths on Irish roads has increased so far this year compared to last, with 56 fatalities recorded, an increase of five from 2019.