Handling Dynamic Time-Bounded Restrictions with access:conditional

[avanish724]

I am using OSRM v5.27.1 to create a custom routing solution and have encountered a challenge with time-bounded restrictions.

Problem Description
My goal is to restrict access to a road segment only during a specific time window each day.

• Tag Used: I've added the access:conditional = no @ (01:30-03:40) tag to a road segment.

• My Understanding: As per my understanding that OSRM evaluates this condition at the time of the osrm-extract command. I ran the full build process (extract, partition, customize) while the current time was within this window.

• Observed Behavior: The route correctly avoids the restricted road segment. However, after the time window passes (e.g., at 03:45), the route continues to be blocked. The road does not become routable again.

This seems to indicate that the graph has become a static "snapshot" of the road's state at the time of the build.

Discussion
Is this the expected behavior for access:conditional tags? If so, what is the best practice for handling time-based restrictions that change throughout the day (e.g., a rush hour restriction)?

It seems highly inefficient to have to run a full graph rebuild for every time window change (e.g., one graph for 01:30-03:40, another for 03:41-01:29). I've seen some advanced flags and a time-zone file discussed. Can you provide guidance on the correct workflow for using the --parse-conditional-restrictions and --parse-conditionals-from-now flags for a truly dynamic solution?

Thanks in advance

[avanish724]

@DennisOSRM @TheMarex @daniel-j-h @oxidase Please help 🙏