It looks pretty odd in Oakland, California, where the elevated freeways pass through the city. I guess the DEM they are using for that place is based partially on aerial radar surveys, partially on ground surveys? That's my guess based on the way the local streets cross the elevated freeways.

Example: this DEM thinks there is a local discontinuity where a cyclist will ascend at +22% where this street crosses a buried freeway. https://graphhopper.com/maps/?point=37.80737%2C-122.279329&p...