Firefighters have been called to a fire at a business on the main road between Lancaster city centre and the M6.
The call-out on Friday morning was to a building on the Dennison Trailers site on Caton Road.
A Lancashire Fire and Rescue Service spokesperson said: "We currently have six fire engines attending a commercial building fire on Caton Road, Lancaster.
"Please avoid the area and consider alternative routes.
"If you can see or smell smoke, please keep your doors and windows closed. Thank you."
The call out came at 10.39am.
Six fire engines and an aerial ladder platform from Lancaster, Morecambe, Bolton-le-Sands, Hornby, Fulwood and Chorley attended.
"Firefighters are using breathing apparatus, one hose reel jet and a ground monitor to tackle the fire," said the spokesperson.
"Crews remain in attendance."


Guys Thatched Hamlet closes suddenly after 46 years
Teenager spared jail for causing death of newborn child in Morecambe
Morecambe Town Council agrees budget and 2.46 per cent rise in Council tax share
Builders of new Lancaster housing development offer £2k cash pot to community groups
Lancaster centre welcomes mayor for opening of new community kitchen
Lancaster shop to close as high street gaming chain faces administration
Jim Bentley returns for second spell as Morecambe FC manager
Ashvir Singh Johal’s reign as Morecambe manager comes to an end
Lancaster writer's ghost story of Morecambe to be voiced by acting legend on Radio 4
Change of name announced for popular Morecambe bar
Opening announced for new Morecambe bistro inside former post office
Health watchdog report shows improvements to services at Royal Lancaster Infirmary
LISTEN: How Leo's Gym is making a difference in memory of young Morecambe boxer
LISTEN: Lancaster set to celebrate Chinese New Year
Lancaster’s Vue Cinema under new ownership
Lancaster city centre car park to close ahead of "catalyst for the development of the Canal Quarter"
Crews tackle commercial building fire in Lancaster
Heritage plaque to mark first Lancaster University site and Gillow factory
Heysham men appear in court in connection with death of cyclist in Morecambe
Fundraiser launched for Heysham family who lost everything in house fire

