Yes, ROADBLOCKS is a Scrabble word!

Letter values in Scrabble US: R 1, O 1, A 1, D 2, B 3, L 1, O 1, C 3, K 5, S 1.

Is it a valid word?

ROADBLOCKS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

any condition that makes it difficult to make progress or to achieve an objective
a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.