TripPath Traversibility

TripPath has traversibility settings for driving, cycling, walking:
optional Traversability driveability = 4;
optional Traversability cyclability = 5;
optional Traversability walkability = 6;
Should have settings for other modes as well? An array? Or just info for the current mode? This seems to be not easily extended. Do we need information for other than the current mode (e.e.g maybe for pedestrian we need to know if other edges being crossed have driving traffic)?

For OSRM compatibility we need to know if any intersecting edges can be part of a valid route and this information is not contained for some of the travel modes.