De or het filevrij?

The correct Dutch article is:

de filevrij

Rule Words ending in -ij and -erij: usually de. See the rule

How to use filevrij

the filevrijde filevrij
this filevrijdeze filevrij
that filevrijdie filevrij
our filevrijonze filevrij
your filevrijjouw filevrij
every filevrijelke filevrij
which filevrij?welke filevrij?
a big filevrij / the big filevrijeen grote filevrij, de grote filevrij