Question 1

How does RRRR compare to OpenTripPlanner for transit routing?

Accepted Answer

RRRR focuses on extreme memory efficiency and offline capability using the RAPTOR algorithm, ideal for resource-constrained environments, while OpenTripPlanner offers more features like multi-modal routing and a Java-based ecosystem but with higher resource usage. RRRR is better for specialized, high-performance needs.

Question 2

How to build and deploy RRRR on a server for production use?

Accepted Answer

Follow the README steps: compile with make, set up zeromq for worker communication, and use memory-mapped timetable files. Scale by adding more worker processes that share the data file, but be prepared to manage C dependencies and potential real-time integration complexities.

Question 3

Can RRRR handle real-time bus delays and updates effectively?

Accepted Answer

It's designed to support real-time updates via protocol buffers and message passing, but the README notes this is still evolving with 'eventually' phrasing, so implementation may require custom work and isn't plug-and-play yet.

Question 4

What's the memory footprint for a city like Amsterdam with RRRR?

Accepted Answer

Based on the README, a Portland-sized system stays under 10MiB, and full Netherlands coverage is about 20MiB, so Amsterdam should be very low, making it efficient for mobile and embedded use.

Question 5

Does RRRR support walking distances between transit stops?

Accepted Answer

No, the README admits that on-street searches are not handled in the first phase, so walking routes need to be added separately or integrated in future updates, limiting immediate door-to-door planning.

Question 6

Is RRRR suitable for a small transit agency with simple routes?

Accepted Answer

It can work, but RRRR is optimized for large-scale networks and real-time updates; for small agencies, simpler GTFS-based tools might be easier to deploy without the C complexity and setup overhead.

Question 7

How to add custom GTFS feeds and test them with RRRR?

Accepted Answer

Use the provided Python scripts (gtfsdb.py, transfers.py, timetable.py) to convert GTFS to the timetable.dat file, then run the testerrrr tool for validation, but this process requires manual steps and debugging as per the README.

RRRR Rapid Real-time Routing

What is RRRR Rapid Real-time Routing?

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