LTS and bike

[xtimbeau]

Hi guys,

Have you any idea on how it would be possible to calculate distances and time travel using the option of LTS (Level of Traffic Stress) for bike transit. It possible in (the current version of) r5, and can be used for regional analysis in the conveyal GUI.

All the best,

XT

[rafapereirabr]

Hi @xtimbeau . Only recently I saw this info on Conveyal Analysis documentation, so we have to look a bit further into this.

[mvpsaraiva]

Hi @xtimbeau. Thanks for the tip, it actually is quite easy to include this feature in r5r. I've did a quick proof of concept, and you can see how setting different values to LTS changes the results in cycle routing:

We are preparing an update to the package for the next few days, to upgrade to R5 6.2, and we'll include this feature.

[xtimbeau]

great! Le jeu. 8 avr. 2021 à 19:42, Marcus Saraiva ***@***.***> a écrit :

…

Hi @xtimbeau <https://github.com/xtimbeau>. Thanks for the tip, it actually is quite easy to include this feature in r5r. I've did a quick proof of concept, and you can see how setting different values to LTS changes the results in cycle routing: [image: lts] <https://user-images.githubusercontent.com/7387691/114072034-2d64a480-9878-11eb-933f-8744ad7be1fe.jpeg> We are preparing an update to the package for the next few days, to upgrade to R5 6.2, and we'll include this feature. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#160 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANA2KEPVHIGFVLQMZ6WOGMDTHXTIDANCNFSM42REKL6A> .

[rafapereirabr]

For the record, there are two posts by the Conveyal team that bring more info on how Bicycle Comfort is addressed by R5: Part 1 and Part 2.

[mvpsaraiva]

It works for detailed_itineraries() as well:

LTS has an impact on travel times and distances:

LTS	Time (min)	Distance (km)
1	100	7.4
2	61	8.3
3	53	8.1
4	42	7.2

[mvpsaraiva]

I've added a max_lts parameter to travel_time_matrix() and detailed_itineraries() functions in the current development version of the package.

Rough examples of how to use them are here: travel time matrix and detailed itineraries

[rafapereirabr]

@mvpsaraiva , what is the default LTS used by R5 in Conveyal analysis ?

[mvpsaraiva]

@mvpsaraiva , what is the default LTS used by R5 in Conveyal analysis ?

4, which is the maximum, and means that any road can be used to ride. In other words, a value of 4 means the LTS parameter has no effect.

[rafapereirabr]

Hmmm. I see. I'm wondering it we should use LST 2 as default. This is the description they included in their post:

• LTS 1: Tolerable for children. This includes low-speed, low-volume streets, as well as those with separated bicycle facilities (such as parking-protected lanes or cycle tracks).
• LTS 2: Tolerable for the mainstream adult population. This includes streets where cyclists have dedicated lanes and only have to interact with traffic at formal crossing.
• LTS 3: Tolerable for “enthused and confident” cyclists. This includes streets which may involve close proximity to moderate- or high-speed vehicular traffic.
• LTS 4: Tolerable for only “strong and fearless” cyclists. This includes streets where cyclists are required to mix with moderate- to high-speed vehicular traffic.

[mvpsaraiva]

That's interesting... LTS 2 seems to be much more realistic for regular analyses.
I agree with the change in the default, I think it makes more sense. The only issue is that we will be changing the behaviour of existing code.

[rafapereirabr]

Closed with commit 7871ea1.