In a state where four out of five traffic improvement projects bust their original deadlines, Florida transportation officials expect to beat the odds with one of the largest jobs ever undertaken in the Sarasota-Manatee region. Construction of the state’s first diverging diamond interchange at Interstate 75 and University Parkway, which began Aug. 3 and is set for two years, will end before the September 2017 World Rowing Championships draw tens of thousands of visitors to nearby Nathan Benderson Park, state officials promise. But the timeline leaves Prince Contracting, the Tampa-based company that won the $74.5 million contract, just one month...