Twas terrifying to say the least at 40mph.
It should be terrifying. The speed LIMIT is 25mph! The lanes are nine feet, most buses (and trucks) are 8 feet, plus mirrors.
The grating causes some tires/vehicles to "squirm" around, and be hard ro steer accurately. The 18 wheeler I used to drive over it 6-8 times a day was one of those vehicles.