You'd have a rough time on the Mackinac bridge in MI. The center two lanes are steel grating so you can see straight down. I usually use the concrete curb lane, mainly because the grating can be slippery.
15 BMW RnineT
10 Ducati 1098 Streetfighter S - "Sleipnir"
09 Kaw Versys
67 Triumph Bonneville TT Special