让路 means 'to make way' or 'to give way' — you move aside so someone or something can pass. It's a separable verb (离合词): the object 路 can split off from 让 when you add measure words or durations between them, like 让一下路 ('make way a bit') or 让开一条路 ('clear a path'). The person you make way for is usually introduced with 给: 给客人让路 ('make way for the guest').