Curb cuts

In our neighborhood there are no curb cuts to get from the sidewalk to the bike lane or to get from the bike lane to the street.  Instead asphalt has been added to create a ramp.

bits of asphalt to create ramps instead of curb cuts

I don't have a problem with this going up onto the next level, but I haven't figured out how to see where they are when going down a level.  The curbs are low and my bike has large tires so it isn't a problem, but I wish I could figure it out.