This is the 6215th most frequent Russian word.
транспортные
"Transport-related" or "transportation."
Here, 'транспортные' describes 'системы', referring to systems related to transportation, often infrastructure like buses, trains, etc.
Городские транспортные системы нуждаются в улучшении.
Urban transport systems require improvement.
In this sentence, 'транспортные' is used as an adjective modifying 'средства', giving the meaning of something related to transportation.
Транспортные средства являются важной частью нашей жизни.
Transport vehicles are an essential part of our life.
In this example, 'транспортные' modifies 'затраты', indicating costs associated with transport or logistics.