Za razliku od utovarne rampe utovarna ploča je horizontala

Možda će vam tekst na sledećem linku biti od pomoći:
http://www.osh.govt.nz/order/catalogue/pdf/frklftac.pdf
12.3.14
Before driving over a dockboard or bridge plate, be sure that it is properly secured. Drive carefully and slowly across the dockboard or bridge plate, and never exceed its rated capacity.

dock board je utovarna rampa
http://www.dockplates-dockboards.com/selection2.aspx

Evo slika za utovarnu rampu:
http://autoline-eu.rs/s/viljuskari-utovarna-rampa--c22tk2548...

Primer kod šinskih vozila i kamiona, iz ovoga se jasno vidi da je bridge plate horizontalan element:
http://en.wikipedia.org/wiki/Bridge_plate
Bridge plates are used on some low-floor light rail vehicles to provide for wheelchair access. The bridge plate extends from the vehicle to the platform, which must be raised to close to the level of the floor of the vehicle so that the wheelchair need not travel over an excessively steep ramp (in the United States, the Americans with Disabilities Act specifies that the slope must be no more than 1 inch of rise for every 12 inches of length). Some low-floor buses also use bridge plates (in this case, extending to the curb) to provide for wheelchair access, but many low-floor buses instead use a ramp that normally serves as part of the floor but can be flipped out through the door (using a hinge at the door) onto the curb or street; in this case the ramp is long enough that it can serve as a true wheelchair ramp rather than a bridge without being excessively steep.