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What does YS stand for?

YS stands for Yellow Signal

This definition appears somewhat frequently

See other definitions of YS

Other Resources:
We have 4 other meanings of YS in our Acronym Attic

Samples in periodicals archive:

But, yellow signal means the vehicle has to slow down.
Installation and equipment costs for the 18th Avenue-Alder Street signal were about $1,250, and related improvements still to be added include a yellow signal frame to improve visibility and a new aluminum pole.
Mr Harrison's Swansea to London express train passed through two yellow signals and was unable to stop going through a third signal at red before crashing into an empty freight train which was crossing the tracks at Southall in west London.