Re: [sumo-user] Fwd: Merging and vehicle behavior

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

some notes on the scenario:

- you have emergency braking because 3s of yellow time are insufficient for safe braking if people are routinely over-speeding by 30% (as configured) on a road speed limit of 22.22s

- you have some zipper junctions where you set individual links to pass=true. This is causing collisions because vehicles on these links do not follow the zipper behavior (instead assuming priority) - admittedly it does reduce required lane change and thus helps with traffic flow

- you have vehicles that want to turn left and signaling right because they would prefer to be on the *other* left turn lane but in fact they can pass the intersection just fine and change downstream (the same for right turns)

- it helps a lot to set lcAssertive to a higher value i.e. =2 to increase gap acceptance

- there is a known problem with lane changing efficiency when vehicles have unsynchronized action steps. A simple remedy would be to set your step-length to 0.6 and not use action-step-length (https://github.com/eclipse/sumo/issues/4457)

regards,

Jakob

Am Do., 11. Mai 2023 um 16:21 Uhr schrieb Albert Jeans <ajeans2@xxxxxxxxx>:

Hi Jakob,

Thanks for your reply. I'm attaching all the files (hopefully) that you need to run my scenario (minus the decals). The problem seems to occur when the two right turn lane queues get very long (please scale the traffic by 1.3 or higher).Like real drivers, some of the vehicles jump the queue, expecting to be able to merge farther down. Here's a screenshot of cars with their right turn signals on in a left turn lane.

Many thanks for your unfailing support!

Albert Jeans

Mountain View, CA  USA

On Wed, May 10, 2023 at 12:57 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

The strategic foresight extends to 3000m so drivers should use all the available distance for weaving. I did a quick test and put ~4500 veh/h down that road with 50% of cars forced to weave and didn't observe any problems. Can you provide your scenario files?

Am Mi., 10. Mai 2023 um 01:44 Uhr schrieb Albert Jeans <ajeans2@xxxxxxxxx>:

I am trying to simulate a 4-lane freeway offramp where the left 2 lanes turn left and the right 2 lanes turn right at a signalized intersection at the end of the ramp. The ramp is about 500 m long, but traffic is often heavy enough that queues can fill the entire ramp. Traffic comes from 2, 2-lane highways and there is a significant amount of "weaving." Real drivers know which way they want to turn and merge into the appropriate lanes well before the traffic signal. SUMO vehicles, however, often seem to wait too long, and as  a result, end up at the intersection in the wrong lanes which causes gridlock. I've tried putting additional zipper junctions within the onramp to "encourage" vehicles to get into their proper lanes but that still doesn't work all the time. 

How far in advance do SUMO vehicles start planning to change lanes ahead of an intersection and is there a way to adjust this parameter?

By the way, this is a real road. You can see it on Google Maps at (N 37.410905090334374, -122.07430147214615).

Thank you for any suggestions you might have!

Albert Jeans

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