National Cycle Routes - Derbyshire

Hi

Can anyone tell me about the above please?

I have 2 kids who are getting adventurous and good for a few km although preferably not on the road yet - topic for another stress :)

The Monsal Trail is excellent but very busy and prone to being taken over by fat t**ts riding MTB's far too fast, similarly the Tissington Trail looks worth a look however its the National Routes Im interested in specifically 54 and 68.

What are they like around Hartington please?
Kids are up for it as discussed but possibly not Crowdicote (youd understand if youve ridden it)
Are they lightly trafficed or traffic free and is the surface better for an adult on an MTB or road bike?

Many thanks