Going north on the GSP, the left lane was closed.

Wildwood Crest - Going north on the GSP, the left lane was closed. The electronic sign at mile marker 6 warns it's 31 minutes to the AC Expressway. What are these signs for? Wouldn't it have been better to position the sign north of the on-ramp at Exit 6 to convey information? Don't people in North Wildwood, Burleigh and Whitesboro need to know how much time it takes to get to the AC Expressway?