I'm seeing distinct regional differences here...

In these parts no restaurant will ever check a signature. That is, a sit-down place where they bring you the bill, you hand them the card and they come back with the authorized copies. 100% of the time the wait staff drop the stuff off and walk away in fact.

If it's a restaurant where you go up to pay at a cash, that should be lumped in with stores. And in that case I suppose they might or might not.

Opposite of Mark's experience, here in this part of Ontario, every merchant I've been to that has a new machine has been very quick to point out that I don't need to, or rather shouldn't, give them the card and that I need to insert it into the machine myself.

When i first got the card I had forgotten it had a chip and tried to hand it over. It still happens sometimes if I don't realize the merchant has a chip terminal.