“来往行驶”可以翻译为“run back and forth” 或者 “travel to and fro” ，也可根据具体语境表达为 “operate in both directions” （侧重于双向运行操作）等。
“run back and forth” 强调在两点之间来回、不断地移动行驶，例如：The buses run back and forth between the city center and the suburbs.（公交车在城市中心和郊区之间来往行驶。）
“travel to and fro” 同样表达来回往返的意思，较为正式，例如：Ships travel to and fro across the ocean.（船只在海洋上来往行驶。）
“operate in both directions” 更侧重于说明交通工具、路线等在两个方向上运行，例如：This railway line operates in both directions during peak hours.（这条铁路线在高峰时段双向运行 。 ）