<p>A tractor cab (10) with a roll-over protection structure (ROPS) (13) which has generally vertically extending front corner posts (25) and an opening front window (11) which is hinged (12) along its top edge (15) to a cross member (13a) of the ROPS which extends across the cab at a location set back (X) from the top of the front corner posts of the ROPS. The top edge (15) of the front window is curved to extend around the top front edge of the cab.</p>
