Google turns on their default adblocker within the Chrome Browser.

If you’re the user of the latest Chrome browser, moving forward some of the more most intrusive types of ads are now going to be blocked automatically.

Define intrusive: ads including full-page prestitial ads, flashing animated ads and auto-playing video ads with sound, pops up, makes noise, blocks the screen or won’t go away. But it also includes sites with an advert density of over 30%.

The Guardian really breaks it down in this article.

I don’t see this having too much effect on dealers until you have an intrusive pop-up/overlay on your dealership website or you’re running some aggressive Display Campaigns. Either way, something to be aware of and watch out for.