1. There are a few restaurants that are open around the clock.<br/><br/>2. There are a few restaurants open around the clock.<br/><br/>I don't know if 1 and 2 are the same.<br/><br/>If different how different they are?<br/><br/>What I know is a relative clause plus a be verb can be omitted. <br/><br/>Ex) He is a doctor (who is) working at ABC [ A better example doesn't come to mind -.-;;]