道不拾遗

dàobùshíyí

[no one pockets anything found on the road; no one would keep lost articles found by the roadside] 无人捡取路上失物。 形容刑法严峻, 无人敢犯法。 也形容民风廉直, 社会安宁

为长陵令, 道不拾遗。 --《汉书·何并传》