Vince Cable MP, visiting this year's MACH 2012, at Birmingham NEC - the UK's biggest exhibition dedicated to advanced and precision manufacturing technologies.
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A local councillor has called for action after several women have been walking in and out of heavy traffic.
A 35-year-old and a 27-year-old man, both from the Birmingham area, have been arrested and remain in police custody.
The wheelchair tennis star was 11 weeks when she won the doubles title earlier this month.