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Due to the "tidal phenomenon" of traffic, the traffic flow in the direction of entering the city is large every morning, andthe flow in the reverse direction is small; and the flow in the direction out of the city is large at night, which aggravatesthe congestion phenomenon.However, when changing lanes in tidal lanes, the limitations of guardrails cause the dangerof lane change.We need a portable guardrail that can intelligently change the diversion vehicle group.