Five of us booked the Hop On Hop Off bus with Viator for our two days in Paris. It was fine until I sat in the bottom level front seat and watched as the bus driver texted, talked on the phone and read while he was driving. He had to be reminded by me to move when a light changed. Even though it was far from our stop, I decided that after a few near misses our group got off the bus. I took pictures of him texting and reading and he didn't even notice. I reported him to the office of the tour bus company and to Viator. Viator even gave me a reference number and said someone would be calling back and they never did. I have booked with Viator for years all over the world and have never been so disappointed. Now I question if I should sit on the upper part of the bus since I have no clue what the driver is up to! I am mostly disappointed in Viator that they never followed up with me.