By Crispian Balmer ROME (Reuters) – Italian Transport Minister Matteo Salvini issued a directive on Wednesday telling local councils not to introduce blanket reductions to traffic speeds after Bologna cut its maximum speed limit to just 30 kph (18.5 mph). The previous speed limit was 50 kph (31 mph) – in line with most urban areas in Italy. Bologna, which is run by a centre-left council, this month became the first major Italian city to lower the limit, arguing that the move would improve road safety and air quality. Taxi drivers have led local protests against the reduction, which covers 70% …