Frank Szmulowicz, Ph. D. Aug 27, 2019:

@Jerzy:
Well, I was thinking along the same lines
1) płyta
2) pochylnia
3) przejściowa

The only problem I see is that gangway is pomost itsef.

@geopiet: Throw your hat in the ring.

geopiet Aug 27, 2019:

mostek przejściowy człon/płyta wyrównująca

jerzy cieslik77 Aug 27, 2019:

Thanks Frank, this is a pure invention

Frank Szmulowicz, Ph. D. Aug 27, 2019:

Transition Plate. A sloping pedestrian walking surface located at the end(s) of a gangway.
https://www.access-board.gov/guidelines-and-standards/recrea...
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The transition plate is designed to provide a smooth transition
between the gangway and the float it sits on, eliminating
the 3 ½” step up. Designed for handicapped accessibility,
the transition plate is also useful for hand carts or simply foot traffic.
The standard transition plate is 18” in length.
http://www.superiordocks.com/pricing/img/Transition Plate De...