Thais to make better use of all the time they spend in traffic.是什么从句?最好能举下其他例子~

不定式

是定语从句,其省略了time和they之间的that.
例: I still remember the time we spent together in last summer.

to后面是不定式,they spend..是time的定语从句.
例如：they help to clear the classroom which will be used tomorrow.