@gaudetjaja: And for dominant directions - just increase the number of lanes for THAT particular direction. Difficult to expand? Make overpasses somewhat larger in advance. Anyway, I agree - not so easy to accommodate unforeseen traffic. Oh well, show me the design of similar capacity which is easy to expand...
@gaudetjaja: Let me add: to have this junction on a normal motorway would make its diameter at least 2 km to allow 100 km/h speeds. (anyway, take a look at the mirror reflection of the junction - you will be surprised). So we suggest it should be built on a city bypass with moderate speeds, where a need for parking spaces exists, and where the land is expensive (even more so when we try to sell back its center).
It doesn't seem very safe to have left-exits to a non-motorway (i.e. the roads in the middle of the junction). Left-lane traffic typically has a higher speed, and this design allows traffic to leave the motorway at full speed. This design is also unfit in the scenario of any one direction being dominant qua traffic-flow, which is very often the case. It is very difficult to expand this design to fit an unforseen growth of traffic.
Of course, you are right, DMahalko. This animation is not a real-world situation, just an illustration of an idea of braiding the lanes. All these suspended roads are just an architects view - for the sake of elegance I imagine. In fact it would be possible to do with just 4 short bridges (the central roads could be bent to the right until they pass under the bridge, and only then turn towards the center).
Very interesting, but all those suspended roads will be expensive to construct. A much less costly solution is to build a circular raised earthen berm with normal ground construction on the berm, and just short-span bridges where the upper roads cross the lower roads. Only would need 8 bridges for this design, 4 for the tangent ring roads, and 4 for the center usable area perpendicular roads.
@gaudetjaja: And for dominant directions - just increase the number of lanes for THAT particular direction. Difficult to expand? Make overpasses somewhat larger in advance. Anyway, I agree - not so easy to accommodate unforeseen traffic. Oh well, show me the design of similar capacity which is easy to expand...
ausriusj 6 months ago
@gaudetjaja: Let me add: to have this junction on a normal motorway would make its diameter at least 2 km to allow 100 km/h speeds. (anyway, take a look at the mirror reflection of the junction - you will be surprised). So we suggest it should be built on a city bypass with moderate speeds, where a need for parking spaces exists, and where the land is expensive (even more so when we try to sell back its center).
ausriusj 6 months ago
It doesn't seem very safe to have left-exits to a non-motorway (i.e. the roads in the middle of the junction). Left-lane traffic typically has a higher speed, and this design allows traffic to leave the motorway at full speed. This design is also unfit in the scenario of any one direction being dominant qua traffic-flow, which is very often the case. It is very difficult to expand this design to fit an unforseen growth of traffic.
gaudetjaja 6 months ago
Of course, you are right, DMahalko. This animation is not a real-world situation, just an illustration of an idea of braiding the lanes. All these suspended roads are just an architects view - for the sake of elegance I imagine. In fact it would be possible to do with just 4 short bridges (the central roads could be bent to the right until they pass under the bridge, and only then turn towards the center).
ausriusj 7 months ago
Very interesting, but all those suspended roads will be expensive to construct. A much less costly solution is to build a circular raised earthen berm with normal ground construction on the berm, and just short-span bridges where the upper roads cross the lower roads. Only would need 8 bridges for this design, 4 for the tangent ring roads, and 4 for the center usable area perpendicular roads.
DMahalko 7 months ago
Well, if there is one, it was not intended... :-/ But now that you mention it - many square symmetric ornaments could be blamed like this.
ausriusj 7 months ago
I saw a nazi sign.
ScionLo 7 months ago