get his car back on to the course 请教on的意思

get his car back on to the course 请教on的意思
get his car back on to the course
使他的车回到跑道上来.
如果不要on应该也是对的吧?那on是什么意思?（是不是有继续的含义在里面?）它的用法是怎么样的呢?谢谢哦