Our neighbor to the north, Fukuoka, has received well-deserved praise for its response to a sudden, gaping sinkhole. The photo at left below shows the giant pit and, at right, its appearance (disappearance?) two days later. Some have mentioned the influence financial loss has had; others, the glacial pace of many more road projects in Japan - these sentiments are understandable yet do not detract from the astounding rapidity of this recovery.

https://www.theguardian.com/world/2016/nov/15/japan-fixes-vast-fukuoka-city-sinkhole-repaired-two-days