Budget constraints and TT course maintenance mean other roads are left without important work being completed.
Director of Highways Richard Pearson says he's very aware many roads aren't in the best condition.
However, he says annually the TT circuit needs between £600,000 and £700,000-worth of work, and that gets priority.
Mr Pearson admits some roads aren't how he'd like them:
"It helped save my life"
Charity hosts pop-up event to promote lifesaving overdose reversal spray
Boutique hotel planned for Peel
Plans also include improvements to nearby Castle Street Gardens
Former TT rider's family at risk of losing house after rejected insurance pay out
Helayna Ingham, wife of Daniel Ingham, posted an emotional plea on social media
Dog wash machine planned for promenade
It would allow people to wash and dry their dogs on the go