Bridges build of ramps of other bridges

[Dwachs]

There is a bug report on the German forum:

http://simutrans-forum.de/forum/index.php?page=Thread&postID=110098#post110098

Building powerline bridges directly above ramps of other bridges yields to problems: both ends of the bridge are not connected, they belong to different power networks. The problem is in grund_t::get_neighbour: the west end of the powerline bridge thinks it is connected to the ramp of the other bridge (and not to its own powerline bridge cables).

Attached is a patch that disallows building bridges above ramps. Any opinions on this?

[prissi]

I agree that even with two level heights we shoudl forbid this.

(Also before release, some automatic tunneling, or mabe tunnel entrances on signle height and double height only for bridges needs to be done. Otherwise tunnels will be almost never ever build in pak128.

[kierongreen]

I thought automatic terraforming was included on tunnel exits?

[DrSuperGood]

I have built a lot of bridges over ramps in the past. dis allowing it would really limit bridge usability to some extent.

That said who actually uses bridge ramps? Normally I elevate the terrain to the bridge level and then down elevate the ends for natural bridge ramps. Bridge ramps need different maintenance costs from actual bridge sections otherwise it is almost always better in the long run to terraform you some natural bridge ramps.

[prissi]

This brings it to the same height clearance level as tunnels, and also prevents a bug with powerlines.  Incorporated in 7605

[Dwachs]

@DrSuperGood the patch only forbids the building of the configuration in the left part of the image, the constructions on the right are still possible:

[Ters]

That said who actually uses bridge ramps? Normally I elevate the terrain to the bridge level and then down elevate the ends for natural bridge ramps. Bridge ramps need different maintenance costs from actual bridge sections otherwise it is almost always better in the long run to terraform you some natural bridge ramps.

I do. It's far easier than going through all those steps you describe. And depending on how I interpret the description, it either looks better or takes less space. The maintenance cost of bridge ends are insignificant in my total economy, once I've gotten past the point where terraforming can be too expensive.

[DrSuperGood]

@DrSuperGood the patch only forbids the building of the configuration in the left part of the image, the constructions on the right are still possible:

Oh, I thought that bug was already fixed. Came across it several times on servers before.

The maintenance cost of bridge ends are insignificant in my total economy, once I've gotten past the point where terraforming can be too expensive.

Unnecessary in pak64 due to how cheap ways are. In pak128 it can save you quite a lot, especially for short bridges as the bridge structure maintenance is several times that of the track. You can reduce the maintenance of a 3 long bridge (such as to cross a river) by over half using natural ramps which is quite significant.

As such I still support special handling of maintenance for bridge ramps.

[Ters]

I rather advocate maintenance costs for artificial slopes. It should cost something to keep them from collapsing.