The whole junction is stuck and an ambulance is trapped inside. Clear the road and let it through in the fewest taps.
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Tap a vehicle to move it out of the junction, but only when its road is clear. Clear enough vehicles and the ambulance's road opens; then tap the ambulance to send it on its way.
A wedding procession, the baraat, moves on by itself after a set number of taps, so plan around it.