in this file photo, a school bus passes through a rural area Wednesday while dropping students off in Belgrade. Nearly 30 years later, Maine lost two young students to school bus incidents within weeks of each other. Janet Mills said last week she is proposing $4.3 million in her supplemental budget to pay for bus crossing arms and anti-pinch door sensors. AdvertisementThe associations representing Maine school boards and superintendents said they are in favor of the proposal. An NTSB official has said the agency typically investigates 10 to 12 school bus crashes in Maine per year.