The Stumblr: Some of San Diego's worst sidewalks.

3000 block of Ocean View Boulevard in the city of San Diego. Photo by Dorothy Kwiat

3000 block of Clay Avenue in the city of San Diego. Photo by Dorothy Kwiat

3900 Sorrento Valley Boulevard in the city of San Diego. Photo by Kevin Montgomery

Kevin adds: “Lots of folks walk or run through this light industrial neighborhood at midday and before and after work.”

4000 block of Sorrento Valley Boulevard in the city of San Diego. Photo by Kevin Montgomery

Kevin adds: “This is a particularly nasty tripper as it is in the shade of a pine tree — virtually invisible after dark. While this is a light industrial area, lots of folks walk and jog here at midday or before and after work.”

4600 block of 30th Street in the city of San Diego. Photos by Dagny Salas

2900 block of Madison Avenue in the city of San Diego. Photos by Lisa Halverstadt

1700 Granada Avenue in the city of San Diego. Photos by Andrew Keatts

4600 block of Kansas Street in the city of San Diego. Photos by Lisa Halverstadt

3500 block of Felton Street in the city of San Diego. Photo by Liam Dillon

4000 block of Utah Street in the city of San Diego. Photo by Dagny Salas.