Flank & Appropriation Route Type-Family
Flank & Appropriation Route Type-Family
Routes that run along other routes or atop (thereby replacing) other route structures...
(Access roads that run alongside modern suburban roads or superhighways are excluded; they are modern engineered routes the belong elsewhere...)
Canal-Flank Route Type / Canal-Side Route Type
Semi-engineered route - but not because the route itself is engineered. This is a result of canal construction: The canal is designed to conform to the terrain, with some earthmoving. Since the canal assumes superiority in transportation, any nearby roughly parallel road is realigned to be adjacent to the canal right-of-way. This eliminates landlocked parcels, where usable land would be trapped between the two transportation structures.
Similar to "access road" created with modern highway or arterial street redesigning.
Exemplia Gratia:
Canal Appropriation~ Type
The abandoned canal prism and towpath are modified and reused as a road, obliterating the canal structure but generally preserving its route.
This is not the same as realigning the road alongside the canal structure, but it is usually a realignement of a road that had already undergone that readjustment 70-80 years before.
Exemplia Gratia:
Railroad-Flank Route Type / Railroad-Side Route Type
Same as above, but with a railroad, instead of a canal: Semi-engineered route - but not because the route itself is engineered. This is a result of railroad construction: The railroad is designed to conform to the terrain, with some earthmoving (more than the canal). Since the railroad assumes superiority in transportation, any nearby roughly parallel road is realigned to be adjacent to the railroad right-of-way. This eliminates landlocked parcels, where usable land would be trapped between the two transportation structures.
Similar to "access road" created with modern highway or arterial street redesigning.
Exemplia Gratia:
Railroad Appropriation~ Type
The abandoned railroad bed is modified and reused as a road. This is not the same as realigning the road alongside the railroad structure.
Exemplia Gratia:
Same as above, but with a road, instead of a canal or railroad: This is a result of (rarely) canal or (more often) railroad construction in level land, where an existing road already conforms to the terrain, or there is not enough terrain to conform to, and the road is going in the right direction.
In this case, little earthmoving is needed for the more terrain-sensitive canal or railroad, and so the new canal or railroadis aligned to be adjacent to the road right-of-way. This eliminates landlocked parcels, where usable land would be trapped between the two transportation structures. More importantly, it allows interconnection between the two transpoortation structures such as depots or transfer stations.
It is not always clear which came first though; investigation into histories may be needed to be sure.
Exemplia Gratia:
Parallel Railroad Route Type
Same as above, but with two railroads, instead of a canal or railroad and road: This is a result of a later railroad following in the footsteps of an earlier railroad. It occurs in level to hilly terrain, as long as the two railroads have the same short-term destination.
Exemplia Gratia:
