SAFETY APPARATUS FOR INDICATING THE USAGE STATE OF A SEAT BELT

Safety apparatus for indicating the usage state of a seat belt. The seat belt has a strap (3) spooled from a retractor and being lockable to a buckle (2) by a tongue (4). The apparatus has an indicator unit (5) for mounting to an upper part of a seat (1). A lock indicator (9) is provided on the indicator unit (5) and, in use, is operably connected to the buckle (2) for indicating a state when the tongue (4) has been locked into the buckle (2). A strap indicator (11) is provided for indicating a state when a spooled length of the strap (3) exceeds a threshold corresponding to a predetermined minimum length of strap (3) needed to secure a body with the seat belt. The lock indicator (9) and the strap indicator (11) are detectable by a camera (7).