I had to navigate several long tunnels. One became very unpleasant as the lights suddenly went out and I had to ride the last kilometer in complete darkness (no light on the bike as the dynamo was used to charge my phone battery). To minimise my time in the tunnel, I took a great risk pushing hard hoping to avoid bumps and potholes. Two times I had to stop at the side while cars raced by honking in shock as they late minnute spotted my reflectors...