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Traffic falls through bridge

S

scott967

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us-hawaii
I have an extrusion bridge, actually two segments. (I don't know if there is some limit, but if I did the bridge as a single unit it draws the bridge deck but no support pylons. I had to split the span into two extrusions to get the supports.) Any way, I have a single (in each way) traffic line, but when the traffic in one direction reaches the joint between the two bridges, about half falls through the "crack". I assume this has to two with two side-by-side or slightly overlapping hard platforms. Anyone ever encounter this sort of thing? I've tried playing with the elevation of the bridge points but so far that hasn't fixed it.

scott s.
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Hmm Have a look at the area in Tmf viewer, it's likely that the area fall on a QMID boundary?

In that case, the issue that caused the extrusion bridge problem may also be affecting the freeway traffic? Try splitting the freeway traffic similar to the bridge?
 
scott967 said:
I have an extrusion bridge, actually two segments. (I don't know if there is some limit, but if I did the bridge as a single unit it draws the bridge deck but no support pylons. I had to split the span into two extrusions to get the supports.) Any way, I have a single (in each way) traffic line, but when the traffic in one direction reaches the joint between the two bridges, about half falls through the "crack". I assume this has to two with two side-by-side or slightly overlapping hard platforms. Anyone ever encounter this sort of thing? I've tried playing with the elevation of the bridge points but so far that hasn't fixed it.

scott s.
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Click to expand...

Regarding the pylon issue - how many verts were in the original extrusion bridge? FSX bridge pylons only fall at the vertices of the extrusion bridge.

Regarding the traffic issue - the platforms in the bridge surface (if the extrusion profile is authored to have them) are placed into a list that is queried (along with the terrain) for elevation to establish elevations along FreewayTraffic vectors. We have encountered what you are seeing (vehicles diving off the bridge, then jumping back) where FreewayTraffic vectors go off the sides of the platforms, then back on. If there is a gap between the two platforms I would expect this. I would not expect a problem due to two platforms (with the same elevation) overlapping.

-Doug
 
Doug --
thanks for the reply. I will go back and look at my data. since I was having problems I eventually decided to bite the bullet and work on some associated shorelines which with improved accuracy allowed the extrusion bridge to be shorter, allowing it to be done with a single bridge.

I did note that I was having elevation problems. On one end, the bridge deck was floating about 2 meters above the pylons at the end which was intended to meed/join the second part of the bridge. It appeared that the hard platform was at the pylon elevation, so all you would see was the top half of the vehicle "on" the bridge deck. I would guess about 50-75% of the vehicles would make the jump between bridges, and the remaining would drop down to the water and follow under the bridge. Adjusting the elevation of final points didn't help. Note that I was still using my initial two points for the altitudeSampleLocations, so that the bridge end (after shortening to get the pylons to draw) was a couple km from the sample location. I will put together some good data on the bridge and post.

scott s.
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