The number of traffic jams nearly doubled in Osaka Prefecture shortly after a strong earthquake rocked the western metropolitan area in mid-June, according to analysis carried out by Yahoo Japan Corp.The number of clogged roads started to rise an hour after the magnitude-6.1 quake hit northern Osaka at 7:58 a.m. on June 18 and increased 1.9-fold at about 11 a.m., according to the analysis, which used data from June 4 and 11 as a base figure.Yahoo Japan analyzed the situation based on the running speed of vehicles using the major internet search engine operator's car navigation smartphone ap…READ FULL ARTICLE