A Crosby campaigner said floodwater on the area's road will end up leading to fatal crashes unless they are urgently dealt with.
Diane Roberts is compiling a list of floodwater hot spots in the area following the heavy rains over the weekend.
She said many roads throughout Crosby, Thornton and Hightown become perilously dangerous during periods of rain.
The Labour candidate for Manor Ward for May's local elections conducted a roving surgery at the weekend when she asked residents throughout the ward if there were any issues which they wanted tackling. One of the biggest concerns was the flooding problem.
Diane said: "Because of the heavy and persistent rain we had over the weekend, I have seen lots of roads in the area in which water has gathered forming large lakes of water on the public highways.
"On many occasions, I saw cars being caught unaware by the rain water and plough straight into deep pools. The dangers of this are obvious. A car could easily aquaplane and collide with oncoming traffic or even pedestrians.
"It is dangerous and I'm liaising with my Labour colleagues on the council to discuss the issue as well as directly communicating with the council officers to highlight the problem areas."
Diane said although the problem has been highlighted by the weekend's heavy rain, it isn't only an issue during heavy rain.
Diane said: "Motorists and pedestrians alike will have spotted some major problem areas, like Lydiate Lane in Thornton, because of the weekend's downpour, but we will all be aware of large puddles which gather on the roads during periods of lighter rain.
"I'm compiling a full list of these to present to the council to ensure they are aware of the worst affected areas.
"I would welcome anyone contacting me with the problem spots directly by writing to email@example.com or firstname.lastname@example.org
"This is a problem which can be dealt with and if it isn't it will end up costing lives."