I hope that the cyclist was somehow at fault and not the immediacy of the shoreline bike trail.
Because of my back I am limited until the back heals to shoreline flat rides. Along this trail is an underpass under an aircraft crossing from the old airport to the new. It is 15 feet below sea level! There must be pumps on the drains under there because the most water I've ever seen there is a steady stream from the constant rain. It flows into the drains and disappears;
I thought that perhaps my altimeter was screwed up but a little further south is a bridge crossing a creek. At low tide the bridge is 9 feet above sea level and it properly showed that altitude. (12 feet to the handlebar mounted Garmin).
Perhaps more interesting is that the road that passes by the Golf course meanders up and down a little. This is all built on land fill. The road in and out of the original Bay Farm Island is about 10 feet above sea level but the back road is below sea level in places. Did someone say that there was sea level rise? Not on San Francisco bay.