Someone found their hiding spot. They're toast.

If I understand correctly, "bush meat" has only recently come to be sold in great amounts in African markets, because roads built by one or another of the extraction industries have made it possible for hunters to get close to populations of animals.  In this case, presumably, where these lowland gorillas live is still rather remote and hard to reach.

Nevertheless, there is no denying that the population remains fragile.

Yes Canis, you point out one of the many things inherently wrong with roads.  And these inherent wrongs are one of the reasons why just replacing petroleum with another fuel will not solve the ecological or environmental problems caused by driving.