Endless Travel: Abstract Thursday

This is my submission for this week's abstract Thursday, hosted by Ingeborg.
I spotted the endless stream of people travelling up and down the escalators in a nearby department store this morning, and this gave me the idea for this week's theme of travel.
I like the line of robotic figures moving horizontally and vertically in the resultant image. Whether or not this is technically abstract I'm not sure, but I like the result.