The move follows concerns about access around the estate because cars are being parked in an inconsiderate way preventing larger vehicles from getting through.
Delivery vehicles, emergency vehicles, waste collection lorries and buses have all experienced problems on certain parts of the two routes, with public transport in particular being cancelled on occasion.
This trial will initially last for six months and residents will have the chance to comment on the new lines.
Cllr Elfan Ap Rees, North Somerset Council’s executive member with responsibility for roads said the trial was in response to repeated issues on Newfoundland and Phoenix Way and complaints from residents and local councillors.
“These roads are narrow and one car parking in an inconsiderate location can cause chaos for larger vehicles.
“By introducing a mix of single and double yellow lines we hope to stop rogue parking and keep traffic flowing around the estate.”
The works are set to start during the week commencing Monday 26 November and where the lines are implemented there will be notices attached to street lights informing residents on how they can comment.
Details of all the works are available at Portishead Library. At the end of the trial period any improvements required as a result of public comment will be considered and implemented where practical.
Parking attendants and the local police will be monitoring the situation with fines issued for drivers ignoring the restrictions.