This is the 17518th most frequent Russian word.
транзитного
"Transit" or "transitional" (adjective form).
In this sentence, 'транзитного' refers to a security employee who works in a transit area, indicating function or designation.
Мы прошли через транзитного сотрудника службы безопасности.
We passed through the transit security staff.
Here, 'транзитного' modifies 'транспорта', indicating transportation serving transit purposes.
Роль транзитного транспорта в экономике города велика.
The role of transit transport in the city's economy is significant.
In this instance, 'транзитного' describes a passenger who is in transit between locations.