Community members helped police tackle speeding motorists in Accrington and Great Harwood.
Residents were at Royds Avenue and Queens Road West, Accrington and Russell Place, Great Harwood on Thursday.
More than 300 vehicles were checked and five letters were sent to those caught speeding.
The volunteers worked alongside officers to carry out the checks after becoming concerned about out of control motorists.
PC Dave Render said the scheme aims to educate people about the consequences of speeding, using a mobile phone while driving or failing to wear a seatbelt. .
He said: "Community Road Watch Scheme launched in 2011 and is another tool that we can use to slow vehicles down and educate drivers about the importance of road safety.
"Involving residents in the scheme allows them to help resolve the problem and means that the volunteers can spread the message to speeding motorists about the benefits that driving more slowly and safely in residential areas has for them, their family, and their neighbours.
"I would like to thank the team of community volunteers, which included Special Constables and Neighbourhood Watch members, for their time. Their contribution has helped to make our roads safer."
Volunteer John Aizlewood, who volunteered as part of Community Road Watch, said residents showed strong support for the cause.
He added: "I had already raised concerns about vehicles travelling at excessive speed and using mobile phones. I hope that they will take this advice and it will prevent collisions occurring that otherwise could cause serious injury to innocent motorists and pedestrians. More volunteers for the scheme would be very welcome."
Anyone who is interested in finding out more about the scheme or volunteering to become a member of Road Watch can contact their local neighbourhood policing team. Road-related offences can be reported to the police on 101 or anonymously to Crimestoppers on 0800 555 111.
