Crossword Clue:

Diagonally or a hint to four of this puzzles squares

AnswerCrossword Clue
CROSSCOUNTRYOne way to run ... or a hint to four geographical intersections found in this grid
MINDTHEGAPUnderground warning ... or a warning about four squares in this grid
TVSPOTSMany P.S.A.s ... or the four circled squares in this grid?