A road will be closed until December while a bridge is repaired by Powys County Council.
Llanfyllin Town Council has confirmed that at the Pont y Forwyn Bridge between Llanfechain and Llansantffraid a traffic light system will be set until the bridge wall repairs have been carried out.
Work will begin on Tuesday afternoon (August 11) and will continue until it is repaired in December.
There were no injuries during the collision last week.
Fire and rescue crews from Llanfyllin and Oswestry crews attended the crash at 4.30am on Tuesday morning (August 4).
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