Is this unnamed part the C16 Tynwald Hill Road / Bayr Cronk y Tinvaal ?

It's noted on Manx language Wikipedia and previous version of the English language wiki - https://en.wikipedia.org/w/index.php?title=List_of_roads_in_the_Isle_of_Man&oldid=56860409 - which I added 18 years ago but didn't cite the source properly... d'oh.

A 2020 Facebook post suggests it just may all be known as the C16 Glen Mooar Road:

"The C16   GLEN MOOAR ROAD, ST JOHNS is to be resurfaced from the junction of the A1 Peel Road (Tynwald Hill crossroads) and the junction with the Glen Mooar Loop Road/Tynwald Mill Road."

https://www.facebook.com/iominfrastructure/posts/advanced-notice-road-closurethe-c16-glen-mooar-road-st-johns-is-to-be-resurfaced/2704423326300381/