I am not sure what the case is today and in all areas but for what it’s worth, in 2013ish when I got hit with two tickets back to back when I drove to a confere

I am not sure what the case is today and in all areas but for what it’s worth, in 2013ish when I got hit with two tickets back to back when I drove to a conference that was on the edge of the congestion zone two days in a row, I went back to the location on foot and walked all around and there was zero signage indicating that the street I turned onto was the congestion zone, and the opposite end of the street I turned immediately out of it.