Hi,

The eastern end of the street is marked as maxweight=3.5: https://www.openstreetmap.org/way/449366744/which should stop trucks coming in from Clanbrssil Street.

It's not clear what limit applies to Blackpitts or adjacent streets.

I don't think there is a need to apply 
maxweight=3.5 to the centre and west end of the street.