Manholes

California Department of Transportation (Caltrans) standards generally prohibit placing manholes within the traveled way (traffic lanes) of high-speed freeways for safety and maintenance reasons. Instead, they are typically located in the shoulders or median areas. 

所有跟帖： 

• Common sense. -Giantfan- ♂ (0 bytes) () 04/05/2026 postreply 11:28:39

• 這還要搜，高速啊，還井蓋，知道井的作用這裏就沒可能出現井蓋。 -霧中發絲飛- ♀ (0 bytes) () 04/05/2026 postreply 11:33:45

• 法製國家；嘛嘎 -胡雪鹽8- ♂ (0 bytes) () 04/05/2026 postreply 11:41:28