Six months after Tucson voters overwhelmingly passed a sales-tax increase for road repairs and public safety upgrades, police officers and firefighters are beginning to reap the benefits. Proposition 101, which passed in May and went into effect in July, raised the city sales tax from 2 cents per $1 to 2½ cents per $1, in an effort to raise $250 million by the time it expires in 2022. The Public Safety Tax Oversight Commission has been meeting regularly since September to monitor the progress of the expenditures, which includes nearly $150 million in improvements and repairs for the Tucson Police and Fire departments.