Look at this webcam feed overlooking Grindavík https://www.youtube.com/live/hvcP4kVVOnk https://www.youtube.com/live/hvcP4kVVOnk Go to about 11:58 on the times

Look at this webcam feed overlooking Grindavík https://www.youtube.com/live/hvcP4kVVOnk https://www.youtube.com/live/hvcP4kVVOnk Go to about 11:58 on the timestamp in the bottom right corner, you will see the lava flowing along the berm (which is doing a good job of protecting a large building) while workers with bulldozers and diggers close the gap in the berm that the road goes through. The fissure close to the town opens up at about 12:20. The lava flowing behind the berm reaches the road at about 12:50.