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pierreh last won the day on January 23

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About pierreh

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    Geneva, Switzerland
  1. transit mania- ville

    Nice update. It is indeed a tight area to upgrade. I would remove a short congested section of the raised highway on the left side of the pics. A RHW-8S narrows down to RHW-6S before passing over what looks like an OWR-4 (hard to determine because of the size of the pic), then there is an MIS ramp that descends diagonally to ground level before merging with anothr MIS- I would keep the RHW-8S going until the MIS ramp and let the right-most lane go to that ramp.
  2. The United Cities of Talaran

    The next area of reworking the highway system is in the following case in Arcens: There are actually two locations requiring changes: 1) The parclo, where we see that only some of the links are used, while others are inactive (in the morning commute, which is the one for which things are designed). The unused links will not be removed, but reduced to simple MIS sections; the others will be dimensioned according to their respective loads. 2) The entrance and exit ramps at the top right of the picture. These ramps connect the highway with an avenue with a GLR in the center. There is a heavy load on the avenue and the entrance ramp to the highway, starting at the GLR+bus station: the bulk of the load is bus traffic going to Marlande; Sims reach the station by GLR and switch to buses to continue on their commute. The ramps will be redesigned to take the loads into account. A particular challenge is posed by the proximity between the highway interchange and the entrance/exit ramps. Some creativity will be required.
  3. The United Cities of Talaran

    Of course I'll provide the new congestion view: after all the entire exercise was done in order to correct the flagrant overload on the old parclo interchange. However, as noted in my last post, il will take a while for the traffic simulator to 'recover' from the important change. Meanwhile I am doing work in other cities in the cluster, starting with those that require an upgrade of their connection to Marlande, which has to be changed from RHW-6S to RHW-8S. So please hang on and be patient, it will come in due time.
  4. The United Cities of Talaran

    Construction work was completed on the interchange, some surface roads were rerouted, the area formerly occupied by the partial cloverleaf was redesigned and a new commercial zone was defined on that terrain. The Mayor of Marlande and the High Councillor of the United Cities inaugurated the new interchange with much pomp and circumstance. The High Councillor announced that the new interchange was only the start of a complete overhaul of Talaran's highway system. A view of the completed works is shown here: Traffic views will be shown later after the city recovers fully from the enormous disruption caused by the construction works.
  5. The United Cities of Talaran

    The various opponents to the new interchange were able to present their views to the City Hall of Marlande, as well as to the Council of the United Cities of Talaran. Conciliatory talks were held; in the end it was possible to work out an agreement whereby compensations, in terrain and/or in cash, would be guaranteed to all people and businesses affected. As soon as the agreement was reached, work was started and proceeded rapidely. Here is a picture of the current state of the construction, with the remaining 'hot spots' identified: 1 - Replacement of the current 2x3 lane bridges by 2x4 lanes, connection to the highway and widening of the highway on the other side of the bridges. 2 - Rerouting of the 2 one-way roadways to maintain the north-south link in that area; the new roadways will be placed close to the bridges. 3 - Removal, if possible, of the instability of the RHW-8S underneath the flyover 4- Because of the placement of the MIS ramp, the 45 degrees curves need to be moved, leading to the removal of more commercial buildings at the bottom of the picture. The construction work is proceeding. During the reconstruction of the highway, traffic has been diverted on other surface roads, leading to massive traffic jams that are getting on many people's nerves.
  6. The United Cities of Talaran

    The engineers presented to the Highway management an aerial view of the area in Marlande where the new interchange will be built, with some notes and explanations: 1 - The dual OWR-2 with GLR tracks in the middle will need to be either entirely removed, or rerouted if at all possible. The GLR will be converted to a subway. 2 - Residential area to be torn down; residents will be relocated in other parts of the city. The GLR tracks will be removed. 3 and 4 - Commercial areas to be torn down. 5 - Road to be removed without replacement. 6. The area inside the existing parclo will be reaffected to commerce, to compensate for areas 3 and 4- 7. The bridges will need to be converted to support the widening of the highway to 8 lanes. In addition the commercial area on the left of area 3, across the highway, will also need to be at least partially torn down. As soon as the plans were made public, opposition to them started to be organized. A citizen committee was formed under the name "No to the new interchange" and started to gather signatures for a petition to City Hall. Protest marches have been announced. Sofar the Mayor has declined any comment.
  7. The United Cities of Talaran

    During a third session between the engineers and the Highway management, the engineers explained that they could see no benefit in a two-levels solution. Actually the limiting factor, they said, is that it is not possible to construct a flyover above the 90 degrees curve of the 8-lanes highway. This creates a constraint, because flyover bridges can only be properly placed over the straight sections of the higway. However, the engineers presented a third variant of the interchange, in which the various links between the branches have less curves and changes of direction: The highway management liked that variant a lot, and asked for detailed plans showing how many buildings would need to be removed to implement it, and a cost and time estimate.
  8. The United Cities of Talaran

    The engineers worked overtime (and will get generously compensated for that) and returned promptly to the Highway management with a second proposal: This proposal was much better received, since it corrected all defects found in the first one: the interchange is more compact and the unnecessary curves have been eliminated. However, before making a final decision, Highway Management asked for the study of an interchange using two levels above ground. The engineers agreed to look into it.
  9. The United Cities of Talaran

    The Talaran Office of Highway Management mandated an engineering consortium to study the interchange situation in Marlande, illustrated above, and to present proposals. The conditions set were: the main flow (between south and west) must be carried by an 8-lanes highway, expanded to 10 lanes for exit ramps, at surface level. The north branch remains a 6-lanes highway. Other links may use above-surface fly-overs. The first proposal of the engineers, presented as a proof of concept on an empty terrain, is shown here: It was pointed out that the failed link (in the red circle) is a glitch that would of course be corrected in due time. The proposal was rejected on the following grounds: the total surface required for the interchange is too large and, in Marlande, would lead to too many buildings having to be removed; the MIS loop linking the north section to the south is too long, and there are too many unnecessary curves in the ramps on the east side. A more compact interchange is desirable. The engineers were told to return to their drawing boards (or, in fact, to their computer screens) and produce a better proposal.
  10. The United Cities of Talaran

    The highway system in the Talaran cluster is due for a serious overhaul. It was laid when starting the cluster, and aside from a few very punctual upgrades, it has not evolved. Some sections of it are seriously saturated, as was already reported a few times in this CJ. In particular, all highway junctions were built as partial clover junctions ("parclos"), because at the time this was the easiest method available. Meanwhile new techniques for highway construction have been made available, and it is time to put them to work in various situations. The first such junction to be transformed and expanded is in the city of Marlande: The bulk of the traffic (morning commute) is coming from the south and going to the west, using the parclo loop. This is, then, the main direction of traffic, that in the new setup will be turning directly to the left, on a 6S or 8S highway, while ramps will feed the other, less travelled links. As preconditions this will require the upgrade of NAM to version 36 and an in-depth study of the available features in that release. This may take a while.
  11. transit mania- ville

    Very impressive! The bypass filled its function quite properly, removing the congestion on the main north-south highway. There remain some congested roadways on the left of your last two pictures, but perhaps you will be addressing those too. In any case, your masterly use of various options and combinations of RHW and NWM is remarkable. It motivates me to undertake some improvements in the highway system of my Talaran cluster, which I'll be documenting in its own CJ. And I hope of course that you'll develop your city further and deal further with the traffic issues those developments will trigger.
  12. The United Cities of Talaran

    5 cities in the cluster have now reached over 1 million Sims, with a 6th one not far behind. In decreasing order of size we now have: Desognes 1'039'138 Cherenne 1'014'502 Marlande 1'010'771 Prandergal 1'008'699 Salveille 1'002'240 Trelayne 974'438 Deramey 769'063 Polsay 573'560 Arcens 494'824 Which gives a total population for the cluster of 7'887'232 Sims. ------- Relatively to the location of neighbor connections in relation to residential zones: I didn't pay attention to that when I started the cities, and now I am seeing the effect of having neglected that aspect. It is too late to change the layouts. I am resorting to various stategies to cope with the heavy inter-city traffic.
  13. transit mania- ville

    I tested again the RHW-4 stubs. I modified slightly my setup, pushing the train station 2 tiles further from the road, in order to have longer stubs. I ran the test for quite a while. I can confirm your findings. The morning commute is functional: ... and the evening commute isn't - no cars exit from the garage. Whether this is a flaw of the garage, or of the RHW implementation, we don't know at this point. It may be of interest to eventually bring this to the attention of the NAM guys...
  14. transit mania- ville

    2 more tests: 1. With a RHW-2 stub we get normal functionality in both the morning and the evening commute; here is the evening commute: 2. MIS stubs are non-functional; this is not suprising, since they are owrs: Now, I'll try again the RHW-4 stubs, since at least in one of your tests, Brian, the stub leading to the garage was functional in the morning commute; the other one wasn't functional in the evening commute. I wonder whether that can be reproduced.
  15. transit mania- ville

    I tested again the "owr dead-end stup setup", using OWR-1 because that is what was configured by default.. In the morning commute I get plenty of pedestrian traffic going to the garage, sometimes with quite long walks from various residences (because there are no bus stops in the area), but no car traffic at all: The same pattern is seen in the evening commute, in the reverse direction. Note that, in order to try to force car usage, I cut the road links to the commercial area that is reached by taking the railway. To no avail: Sims prefer to take long walks to the garage, I replaced the OWR-1 stubs by RHW-4 stubs. This had a very poor effect: there were no more pedestrians - because there are no sidewalks on the RHW-4, and there were no cars either. In essence, no-one would take the train. The city didn't develop well: I also tried to turn the garage by 90 degrees, so that the other facade would face the stubs. This makes no difference whatsoever.