North Carolina's annual debt affordability study says state government largely continues to be in a fiscally healthy position when it comes to borrowing. The study's authors say the state could approve $4.3 billion in bonds this year — or $1.4 billion annually for the next five years — and remain within self-imposed debt-to-revenue limits. That cap is designed to help the state retain top scores from credit-rating agencies. This debt is repaid with state operating fund revenues. But the report says there's no additional debt capacity right now for transportation projects. This debt is repaid with revenues from things like gasoline and car-sales taxes.