The variation in injury rates and safety benefits of public transit is likely caused by road geometry and other environmental factors; disaggregate analyses at the route level are necessary to determine their effects.
關於唔同既路面狀況(公路 vs 市區 vs 鄉村 vs 山路)
呢度永遠都會有uncertainty,呢句嘢只係好行貨既頭盔
我好同意應該要拆解下邊啲情況下最危險
但我都幾相信,私家車per passenger mile個風險高,應該無論邊種路面都成立