Two-way left-turn only (post-mounted) sign
R3-9b / Regulatory signs
Mounted at the roadside, this sign identifies a center lane used only for left…
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Signs to learn alongside this one
Sources & scope
Independent educational summaries by DMV One Way. Sign designs follow MUTCD conventions; state and local rules can add restrictions. Use your current state handbook and the signs on the road for the rules that apply to your trip.
This explanation has not been reviewed yet. Current guide illustrations: public-domain FHWA Standard Highway Signs. Historical illustrations: DMV One Way archive.