New signal installations: - Reduction in severe crashes (specifically head-on and severe LT angle crashes). - Increase in overall and non-severe crashes (specifically rear-end crashes). - B/C = 1.81. - Return on investment ～ 5 years.
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机译：新的信号装置： - 减少严重崩溃（具体用于头部和严重的LT角崩溃）。 - 总体和非严重碰撞（特别是后端崩溃）增加。 - B / C = 1.81。 - 投资回报〜5年。
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