Drivers have been warned to expect continued delays after an ageing bridge over the M42 has been earmarked for demolition due to safety concerns.The 50-year-old Bickenhill Bridge on the northern side of the Junction 6 roundabout was closed by National Highways in July after inspectors found significant damage to the concrete and corrosion in the steel reinforcement.Following further assessments, engineers concluded the bridge was at risk of furt…