Massachusetts taxpayers would be on the hook for up to $20 million over the next five years to support the Rose Kennedy Greenway Conservancy, a network of parks and green space on top of the Central Artery Tunnel in Boston, under a bill considered Monday by the Committee on Transportation. “We cannot go back on our word,’’ said state Representative Aaron Michlewitz, Democrat of North End, whose district encompasses the tunnel and much of the greenway.
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