1+1=1 Blue Water Bridge
This picture was taken from beneath the Blue Water Bridge(-s). It clearly shows that their construction is of two styles, but observed from either side they appear to be one bridge. Likewise, when traveling from the US to Canada, as shown in this picture, we would take the Blue Water Bridge. Conversely, when returning to the US from Canada, we would take the Blue Water Bridge. So 1 bridge span + 1 other bridge span = (2 sections of) one Blue Water Bridge.
Both bridges are now one-way traffic. The original 1938 bridge has three westbound lanes from Point Edward, Ontario, Canada to Port Huron, Michigan, USA; the later 1997 bridge has three eastbound lanes from Port Huron to Point Edward.
1+1=1 Blue Water Bridge
This picture was taken from beneath the Blue Water Bridge(-s). It clearly shows that their construction is of two styles, but observed from either side they appear to be one bridge. Likewise, when traveling from the US to Canada, as shown in this picture, we would take the Blue Water Bridge. Conversely, when returning to the US from Canada, we would take the Blue Water Bridge. So 1 bridge span + 1 other bridge span = (2 sections of) one Blue Water Bridge.
Both bridges are now one-way traffic. The original 1938 bridge has three westbound lanes from Point Edward, Ontario, Canada to Port Huron, Michigan, USA; the later 1997 bridge has three eastbound lanes from Port Huron to Point Edward.