Traffic restrictions to allow a two-way cycle track on the Sandymount seafront in Dublin will begin on 1 March.
The restrictions will eventually mean no inbound traffic on Strand Road and Beach Road from the Merrion Gates nearly as far as Irishtown as part of a six-month trial.
There will be no northbound travel on Strand Road between Sean Moore Road and St Albans Park as part of initial restrictions from 1 March.
Two way traffic between Merrion Gates and St Albans Park will be maintained temporarily to facilitate local traffic until the works at Merrion Road are complete by the end of March.
Local residents are opposed to the plan as they believe that traffic heading to the port will be diverted into residential streets.
Executive engineer with Dublin City Council, Claire French, told a meeting of the South East Area Committee that initial works will start on 15 February and the first section of the cycle track will take up to three weeks.
The final section to the Merrion Gates will then be completed by the end of March but the one-way system will begin on 1 March.
Independent Councillor Mannix Flynn said it was reckless to impose the plan despite "huge opposition".
He said residents who have already taken a case to An Bord Pleanála were considering a judicial review and added "see you in court".
Chair of the committee, Cllr Dermot Lacey (Labour), said it was a bad day for local democracy as the plan was opposed by four out of five local councillors as well as by many residents and he added that he would support a legal objection.
Head of Technical Services with the council Brendan O'Brien said they will follow the law agent's advice in the event of a High Court challenge.