Formby Labour Councillors Nina Killen, Catie Page and Peter Maguire say they are backing a 20mph restriction on roads in Formby because "when it comes to road safety, every mile-per-hour counts".
Formby Area Committee is due this week to pass proposals to impose a 20mph limit on all roads in Formby, except Liverpool Road, Altcar Road, Church Road and Southport Road.
Sefton's proposals were given a warm welcome by a large proportion of residents during a consultation last year.
A total of 1,581 households in the affected area of Formby were consulted. Forty-two per cent of households responded to the consultation - 71% of whom were in favour of a 20mph restriction.
The cost of the plans will be met by Sefton's Local Safety Budget.
Cllr Killen said she was backing the plans because they would be good for road safety and the environment.
Cllr Killen said: "On most of our residential roads here in Formby, there really is no need to do any more than 20mph. We have a good number of primary schools here in Formby and restricting traffic speed will help to save lives and keep our roads safer for not just our children, but also older people in our community, other motorists and cyclists.
"Studies show that every mile-per-hour over 20mph dramatically increases the risk of serious injury or death in the event of a collision. In areas of Portsmouth where 20mph zones have been introduced, there have been 22% fewer casualties.
"There are also proven improvements in air quality and pollution. Which is obviously beneficial for the whole community.
"There was an excellent return rate for the consultation, which was way higher than the average. With 71% of those people responding positively to the proposals, this is something which clearly has the support of people who live here.
"I have spoken to residents on Harington Road recently who are seriously concerned about the speed of traffic on that stretch of road. The introduction of 20mph zones will go a long way to resolving that issue.
"We have also spoken at length about the issue of speeding traffic with Labour's cabinet member for transport, Cllr John Fairclough, and he agree that action needs to be taken.
"So for all of these reasons, my Formby Labour colleagues, Cllr Catie Page, Peter Maguire and I are backing the proposals."
Cllr Killen, who has three young children, said "20's plenty for Formby".
Cllr Killen said: "I live in this area. I also drive. I fully support 20mph on residential streets.
"Very often, when I am out and about with the children, it can be a real struggle to get across certain roads because of the speed of the traffic.
"But the studies show that people who travel at 20mph in speed restricted areas reach their destination no more than 40 seconds later because the flow of traffic is improved.
"It is better to arrive 40 seconds later than risk seriously injuring a child. It's a small price to pay."