This data is parsed directly (November 2020) from the Zürich city open data set "Fuss und Velowegnetz" (Pedestrian and Bicycle Path Network): https://data.stadt-zuerich.ch/dataset/geo_fuss__und_velowegnetz

The category mapping for "map_velo" is as follows:

0=keine Route in der gedruckten Karte "Map Velo"
1=empfohlene Route
2=empfohlene Route Naturbelag
3=schnelle ergänzende Route
5=Fahrverbot
6=Biketrail

The count of objects per category

0 : 33,576
1 : 4,181
2 : 550
3 : 1531
5 : 31
6 : 21

There is no category 4!

Using the super jq command, each value for the property "map_velo" is split into a unique file.

For example:

cat taz_mm.tbl_routennetz.json |jq '.features |= map(select(.properties.map_velo == 6))' > map_velo_6.json

This data is licensed with CC0 by Stadt Zürich (very cool!)