There are 2 solutions. The longest is RTES with 4 letters, and the shortest is RDS with 3 letters.
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Yes, "HIGHWAYS: ABBR." is currently trending (last update: 19 May 2026). Many solvers seem to find this clue challenging! Other clues with traffic peaks today are: Son of Isaac, Colorful food fish, Removals, Upset and Friendly.
Solutions are between 3 and 4 letters long.