Granite blocks are being installed in Preston City Centre along Fishergate and Church Street.
After discussions with Lancashire Police, Lancashire County Council say the plans are to reduce the risk of a serious incident.
In a statement they said: “This will reduce the space for vehicles to mount the pavement, similar to measures used elsewhere in the UK.”
“However this is not in response to any specific threat.”
The temporary wooden planters that were installed before Christmas 2017 will be offered to local communities around Lancashire.
Work on the shopping streets began Monday 30th September.
“Sensible steps to ensure that the public utilising the city centre, for both business and pleasure, are as safe as possible”Chief Inspector Steve Sansbury from Lancashire Police
The blocks have reflective sections on them to aid their visibility and can also be used as seats.
Safety measures across the UK and in other cities in the world have been implemented to deter terrorist incidents.
Lancashire County Council also said: “It is important that any measures are proportionate and that we can still carry on with our normal daily lives.
“They will further improve pedestrian safety for those enjoying the shopping and night time economy, or for those just passing through the area.
Cabinet member for highways and transport, Keith Iddon said: “Thousands of people come into Preston every day and we have a responsibility to make sure that they can have a safe and enjoyable experience.”