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MobilityData / gtfs-flex

NOTICE: GTFS-Flex has been merged to GTFS. This repo is no longer up-to-date and will deprecated. Consult the google/transit repo for the up-to-date info.
https://github.com/google/transit
Apache License 2.0
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what is the "direct travel time"? #24

Closed tsherlockcraig closed 2 years ago

tsherlockcraig commented 7 years ago

The reference definition of drt_max_travel_time refers to values that are a multiple of the "direct travel time".

This time may be expressed as a value (minutes), or as an arithmetic function where t=[direct travel time]. For example, the formula t*2.5+5 indicates that the maximum travel time for the passenger's demand-responsive travel leg is 30 minutes if the direct travel time is 10 minutes.

What exactly does "direct travel time" mean? Is this supposed to mean "drive time" or something else?

antrim commented 7 years ago

Direct travel time = drive time for most direct path, no additional stops

Sent from my phone

tsherlockcraig commented 7 years ago

Mind if I spell this out a bit more? I'm thinking I'd just use the phrase "drive time assuming there are no other stops".

antrim commented 7 years ago

Sounds good.

ed-g commented 7 years ago

Is this the "drive time" calculated between two sequential stops in stop-times, or the "drive time" along the entire trip?

Or is it calculated as twice the shortest distance between the trip's shape and the requested pickup or dropoff?

Can you give a simple example?

tsherlockcraig commented 7 years ago

Drive time is unrelated to stop_times. It is the car drive time from one point to another, if you queried otp for traveling between origin and destination by car.

Thomas Craig ~mobile

On Sep 15, 2017, at 2:46 PM, Ed Groth notifications@github.com wrote:

Is this the "drive time" calculated between two sequential stops in stop-times, or the "drive time" along the entire trip?

Can you give a simple example?

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ed-g commented 7 years ago

What are the origin and destination in the calculation. The users's start/end location to the end point of the trip? Or the nearest point to the trip alignment?

tsherlockcraig commented 7 years ago

Users start and end locations on the drt leg of the trip.

Thomas Craig ~mobile

On Sep 15, 2017, at 2:51 PM, Ed Groth notifications@github.com wrote:

What are the origin and destination in the calculation. The users's start/end location to the end point of the trip? Or the nearest point to the trip alignment?

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

ed-g commented 7 years ago

The portion of their travel via the transit route which is drt enabled? In other words get on at (lat1,lon1) get off at stop x at (lat2,lon2). Direct travel time is the drive time between (lat1,lon1) and (lat2,lon2).

ed-g commented 7 years ago

Got it, thanks!

tsherlockcraig commented 7 years ago

Yes.

Thomas Craig ~mobile

On Sep 15, 2017, at 2:52 PM, Ed Groth notifications@github.com wrote:

The portion of their travel via the transit route which is drt enabled? In other words get on at (lat1,lon1) get off at stop x at (lat2,lon2). Direct travel time is the drive time between (lat1,lon1) and (lat2,lon2).

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

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