Part-time limits are already being put in place near more than 30 schools across the county following the launch of the initiative in 2014.
Now members of Durham County Council’s Cabinet are being asked to approve a list of 33 more schools to be included in the scheme.
The schools have been selected based on factors including traffic speeds, accident data and potential risk to pedestrians.
Cllr Brian Stephens, Durham County Council’s Cabinet member for neighbourhoods and local partnerships, said: “Lower speed limits have now been implemented at almost all of the schools chosen for the first phase of the scheme.
“This is not only ahead of schedule but also under budget. That’s why, earlier this year, Cabinet was able to agree that the money we have left should be spent on doubling the number of schools covered by the scheme.
“Our aim is to improve road safety and promote a healthy and active lifestyle by encouraging more people to walk or cycle instead of using the car.”
The project is funded by a one-off Public Health Grant of £952,850 and is accompanied by an education programme which aims to make children more road aware, promote cycling and walking and increase speed awareness among motorists.
Cabinet meets at County Hall on Wednesday, 14 December.
If the recommendations are approved, part-time 20mph speed limits would be introduced on roads near the following schools:
Annfield Plain Infant School, Annfield Plain
Annfield Plain Junior School, Annfield Plain
Byron Sixth Form College, Peterlee
Chester-le-Street C of E Primary, Chester-le-Street
Cockton Hill Infant and Junior School, Bishop Auckland
Consett Academy, Consett
Delves Lane Primary, Consett
Easington Academy, Easington
Easington Colliery Primary School, Easington
Framwellgate Moor Primary, Durham
Framwellgate School, Durham
Green Lane C of E Primary, Barnard Castle
Neville’s Cross Primary, Durham
New College, Durham
Our Lady and St Thomas RCVA Primary, Willington
Our Lady of the Rosary RCVA Primary, Peterlee
Our Lady Star of the Sea RCVA Primary, Horden
Pelton Community Primary, Pelton
Ropery Walk Primary, Seaham
Roseberry Primary and Nursery School, Pelton
Sacriston Primary, Sacriston
Seaham Harbour Nursery, Seaham
Shield Row Primary, Stanley
Shotton Hall Primary, Peterlee
St Bede’s Catholic Comprehensive School, Peterlee
St Bede’s RCVA Comprehensive School, Lanchester
St Joseph’s RCVA Primary, Stanley
St Leonard’s Catholic School and Sixth Form College, Durham
Tanfield School Specialist College of Science and Engineering, Stanley
Teesdale School, Barnard Castle
The Academy at Shotton Hall, Peterlee
Whitworth Park School and Sixth Form College, Spennymoor
Willington Primary, Willington