@FrothNinja ' s photograph, showing multiple bridges, set me thinking, we take bridges for granted, I suppose, but, everyone of them is, to a degree, a feat of design and engineering. On our relatively short 15 mile urban ride, this morning, we went over, or under, no fewer than 16 bridges, that is just over one per mile!
Not sure I can specify what all of them go over, or under, but, I will try:
Crossing over the A19.
Going under the Newcastle-Sunderland railway/metro line.
Going under the A194.
Going over the River Don, York Avenue, Jarrow
On the Bowes Cycle Route, going under Campbell Park Road (Hebburn)
Still on the Bowes Cycle Route, going under Monkton Lane (Hebburn)
Still on the Bowes Cycle Route, going over the Newcastle - Sunderland Metro/Railway line
Still on Bowes Cycle Route, a bridge over a now disused railway line.
Still on the Bowes Cycle Route, going under the A184.
Going over the A194M, towards Washington