What speeds are contained in the non free flow (nff) feeds?

The Intermediate Flow feed has the concept of a free flow (ff) feed and a non-free flow (nff) feed, as explained in the documentation (TomTom Traffic Flow - Intermediate Service - Protobuf).

The nff-feed consists of the flow feed segments which contain a traffic delay. The threshold for the nff-feed is per default set at 90% of the free flow speed, so all segments between 90-100% free flow speed are not reported in the nff-feed.

However, TomTom offers the configuration option to increase or decrease the threshold of the nff-feed.

A low threshold (e.g., 70%) will heavily reduce the feed size of the nff-feed, which might be desirable if there are bandwidth constraints for the customer receiving the feed.

A high threshold (e.g., 99%) will allow that more live data is send through the nff-feed but will also increase the feed size.

The filtering is explained by the following graph: