travel by

VERB
9 LETTERS · STARTS WITH T

travel by is a valid 9-letter word worth 16 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1R1A1V4E1L1B3Y4
1 + 1 + 1 + 4 + 1 + 1 + 0 + 3 + 4 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does travel by mean?