Big data

Dear sir Big data Is a extremely large collection of data Where data is collected and analyzed to reveal trends . For example A traffic controlling department. Will obviously aim to minimize the traffic jam in the state . So let’s assume junction A is affected with traffic jam and a lot of complains and accidents occur due to it . So they may collect data for a required amount of period at the junction A . Example implementing a sensor system to find out how many vehicles are passing through that junction A at any given time and then The traffic controlling department would Use that data to analyze and reveal trends of How many vehicles passes through that particular junction A. at a given time . So is this idea of mine correct regarding big data ? Thank you .