If the proposed measures are put into effect, public transport could see significant improvements.

put 是动词，意思是"放置、使处于某种状态"。 into 是介词，表示"进入...状态"或"转变为..."。 effect 是名词，意思是"效果、影响"。 put into effect 是一个固定短语，意思是"实施、使生效"，指将计划或措施付诸实践。