Police are urging drivers to watch out for thieves after more than 100 vehicles were found with valuables left on show.
Officers say thieves can be in and out of a car in seconds, making off with treasured possessions.
They are asking people to heed of simple advice that can stop criminals.
A recent patrol in Halifax town centre found over 100 cars with valuables left in cars and on display, a discovery they describe as “an open invitation to a thief”.
Detective Chief Inspector Terry Long, from Calderdale CID, said: “Our officers are always on patrol in our town centres keeping an eye out for any thieves.
“But we cannot beat car crime on our own – we need the public’s help.
“By following some very simple and straight forward advice people can greatly reduce their chances of becoming a victim of thieves.
“It might sound obvious – but lock your car door. If you car has an alarm – use it. You will be amazed how many people don’t do something that takes a second to do.
“When out and about and if parking your vehicle leave it in a well lit area, ideally a car park with CCTV. If you are at home and have a garage – use it.
“But perhaps the most important piece of advice is not to leave valuable items on show. Either take them with you or hide them away.
“Our officers have been astounded when they have seen valuable items including laptops, wallets and mobile phones on show.
“You wouldn’t leave these things outside on your wall – and the same goes for your vehicle.
“We want to get the message out to as many people as possible and this is another way of spreading the message.”
Anyone information about car crime should call police via 101.
Information can also be passed on anonymously via CrimeStoppers on 0800 555111.