This spike is on N. 34th in Fremont. It's on the south side of the street, maybe two meters from the curb, near the Sunday Market marker for stall 47, about where the new steel towers carry the new high-tension line cross the street. The Burke building is on the south side of the street here.
This is a busy bike route, with several bikes a minute passing through this way during rush hour. On Sundays, this is a very busy walking route, with people packed along the street in good weather.
If these spikes are not pounded down, they can cause a bike flat tire or even loss of control. Eventually they work their way loose. The resulting spike is several inches of hardened steel that can cause a serious injury to a person, a flat tire on a car, and other damage. This is why it's Seattle policy that these spikes get pounded down. Yet it doesn't happen. Now somebody has to take time out of their day to come back out and pound the spike down. It would have been better to do it right the first time.