An advertisement for open Brunswick School Department driving positions displayed on a bus on Pleasant Steet in Brunswick. (Katie Langley/Staff Writer)BRUNSWICK — Maine school districts are ramping up their hiring campaigns for school bus drivers as staffing shortages create transportation challenges. Recent union negotiations raised the starting wage for bus drivers from about $20 to about $25 per hour. Full-time bus drivers in Brunswick have recess and lunch monitoring duties, while part-time drivers and subs can choose to take on fewer routes. He said those interested can go to the Brunswick School Department website or call for more information.