The main downside is not just a cost thing but its waves are blocked by moist in air, rain, and dense fog. So, it will also degrades to just use cameras in this conditions.
From the recent tesla acme test, where the tesla runs into a wall containing a picture of a road, they also tested rain and water blocking two mannequins. The lidar equipped vehicle managed to stop before hitting the mannequins while tesla's autopilot did not. The distance before automatic braking triggered was reduced iirc.
Sure lidar is degraded by rain, but I think the conclusion that when it rains the whole system will degrade to just cameras seems incorrect. It may reduce its effective range but it seems likely to still have some advantage in a wide range of conditions.
Sure lidar is degraded by rain, but I think the conclusion that when it rains the whole system will degrade to just cameras seems incorrect. It may reduce its effective range but it seems likely to still have some advantage in a wide range of conditions.