Context: I'm working on a logical problem as part of my Msc. thesis in GIS. I want to calculate the departure time (output) based on a desired arrival time (input). I have chosen to use an API to outsource much of the coding and maintenance.
Question: What API can be used with the (batch size 1 - 50) input of a desired arrival time (/datetime) and a transport mode of driving to give an estimated departure time/travel duration taking into account traffic conditions such as rush-hour?
API - Travel time based on arrival time | No clear answer is given here
Google Maps Directions API - Arrival time? | 2500+ views on stackoverflow since 2.5 years, no clear answer yet. One of the comments mentions the HERE API, but their documentation suggests it is not possible. See the note in the below picture.
After Taras Comment: Looking for free web service that calculates driving distance between 2 addresses | Question is about driving time, not driving time based on desired arrival time per se. Bing maps, google maps, HERE maps, and arcgis are recommended. As far as I have been able to find, these do not allow for specifying the 'desired arrival time' (except for public transport).
REST calculateroute want to supply arrival time to determine when to depart | Question from 2012 about the same problem, but specific for the HERE maps API. Answered on 4 oct 2018 (6 year later?) that only public transport modality is supported for now.