MERRICK - ? Police are searching for the man who robbed a taxi driver in Merrick. Cops say the driver was dispatched to the intersection of Madison and Bedford avenues just after 11 p.m. last night. After driving a block, the suspect told the driver to pull over and put a knife to his throat, demanding money. Cops say the suspect fled after getting cash and the victim?s cell phone. The driver is OK. Police ask anyone with information to call Nassau Crime Stoppers at 1-800-244-TIPS.