Google announced the launch of enhanced ad sitelinks, which the company calls its “strongest performing experiments.”

Google says that on average, clickthrough rates are 30% higher for ads with sitelinks, compared to ads without.

On the Inside AdWords blog, Google shows the following example. The first ad shows sitelinks. The second image shows text ads from the advertiser’s account.

The new offering would allow for the following:

“In testing, people reported that ads with enhanced sitelinks were more useful and relevant,” Google says. “And clickthrough rates were significantly higher than the same ad with traditional 2- and 3-line sitelinks.”

Only ads that show above Google results are eligible for this format. Also, the advertiser’s account must have active ads that are closely related to the sitelinks in the campaign.