in ‧ road /ˈɪnrəʊd $ -roʊd/ BrE AmE noun [usually plural]
make inroads into/on something
a) to have an important effect or influence on something, especially by taking something away from it:
Video is making huge inroads into attendance figures at movie theaters (=taking away its customers) .
They have made significant inroads into the European market.
The administrative workload is making massive inroads into our working day (=taking away time) .
b) to make some progress towards achieving something difficult:
We haven’t made much of an inroad into the backlog of work.