Form factor
路衝 / Poison arrow
金 / Metal
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Tradition and practical correlate
Whether a road drives straight at the door (路衝, a “poison arrow”) like an arrow — which also means a line of oncoming traffic and headlights.
What the tool checks
Whether mapped road alignment runs directly toward the home or entrance.
What you can verify in person
At the approach, check vehicle movement, headlights, noise and the actual line to the door.
Confidence and limits
The direct alignment and its traffic effects are observable; map data cannot replace an on-site traffic check.