SV agreement

Hello,
Below is from Wiki.

"Drive-throughs typically have signs over the drive-through lanes to show customers which lanes are open for business. The types of signage used is usually illuminated so the "open" message can be changed to a "closed" message when the lane is not available."

The verb in the sentence "The types~" is is. Isn't it are because the subject of this sentence is "The types?"

Thank you very much.