Melbourne police have described a Facebook page that lets drivers know where booze and drug buses are as a "slap in the face" for people who have lost loved ones to drink-driving.

The page was set up two years ago and has more than 17,000 "likes" from users.

Police say it is not illegal to publish the location of booze buses, but they believe the page promotes drink-driving.

"It is not a joke and is a slap in the face to the hundreds of people whose lives are irrevocably affected by drink-drivers in Victoria every year," a spokeswoman said.

"Clearly people running this page have never felt the pain of losing a loved one or having someone they know seriously injured because someone thought it was OK to drink and drive."

The administrators of the page say it can be used to stop drunk people getting behind the wheel.

"It is not this page's intention to encourage drunk or drug driving, nor does it support it," the administrators said.

"However, we have the right to be informed and to know where they are.

"Choosing not to drink-drug drive because a booze bus is nearby could save someone's life, or at a minimum, get them out of a fine."

Police say drink-drivers still risk being caught, even if they know where a booze bus is.