In Italy based on my individual knowledge, I’m not aware on specific guidelines to manage the road cross in case of accident in the two lines shared among multiagency rescue services.

Guidelines in Traffic Police (under the Minister of Interior organization) are possible but only for their internal use.

If the 1-1-2 dispatch (PSAP1) or PSAP2 recognize a road accident in the both road lines, usually rescue teams are activated in both directions. If this complex scenario is only discovered by the first team coming on the accident site, the team could decide to move in the other line accordingly to the injuries severity of the vehicle occupants using some specific gate across the line or chance the direction in the payment stations. If the safety in not guaranteed the cross is strongly not recommended.

The highway security & safety services support the rescue services controlling the traffic.

If the accident involved both line, Traffic Police activates the closure of the road section involved. Usually, the firefighter teams involved in the rescue operation are the authority that approve the road block removal when the scenario is completely safe after the rescue operations. If the highway is a major artery, the local Prefecture monitors the situation with the target to limit the closure time as much as possible.

The steel wire separation is forbidden in Italy. We have “New Jersey” barriers (metallic or concrete).
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