ISTANBUL Inaugurated 51 years ago as the first Bosphorus bridge to unite the Asian and European sides of Istanbul, the July 15 Martyrs’ Bridge has been a vital component of the transportation network of the historic metropolis since then, with around 190,000 vehicles driving across the bridge per day at present. The megacity began to rapidly urbanize after the second half of the 20th century, with communities expanding, waves of migration occurring, and traffic volume climbing, bringing the