GPs have said they will not co-operate with the system proposed by the HSE for the Urgent Care Centre at Roscommon County Hospital.
In a statement, Doctor Martina Cogan said there were fundamental issues on health and safety that are now at stake for over 20,000 people.
She said there is now complete confusion among GPs and patients.
Earlier, an estimated 1,000 people have taken part in five different protests over the closure of Roscommon County Hospital's emergency department.
This evening's protests took place at the bridges across the river Shannon.
300 people protested on the bridge on the N5 Westport to Dublin road in Tarmonbarry and at one stage blocked the road.
People also protested at Lanesboro on the N63 Mullingar to Roscommon road, on the Athlone town bridge and on the bridge at Rooskey.
Protesters also gathered at the gates of Roscommon County Hospital this afternoon. Their aim was to highlight what they say is the lack of the provision of a safe ambulance service in conjunction with the closure of the emergency department on Monday.
This morning, members of the Roscommon Hospital Action Committee staged a protest as Taoiseach Enda Kenny arrived to officially open an extension to a district hospital in Swinford, Co Mayo.
About 20 demonstrators carrying placards accusing the Government of doing a U-turn on its election promises shouted 'shame, shame' as the Taoiseach arrived at the hospital entrance.
The group's Chairman John McDermott said their campaign of opposition to the closure of the emergency department would continue.
Mr McDermott said the group remains determined to get the Government to reverse its decision.
The Taoiseach said there will be no Government U-turn on the decision.