Millions of people get around Istanbul each day via dolmuş, a shared taxi. Similar to the colectivo of Latin America or the dollar vans of New York City, a dolmuş is generally a mini-bus or van that follows a fixed route for a fixed price. At the beginning of the route, the bus waits until it is full of passengers (dolmuş means stuffed in Turkish) before departing. You hand your money (theoretically a share of a private taxi’s rate, but usually 2-3 TL) up to the driver, and hop out whenever you get to your destination; there are rarely official bus stops.
The video above may look like it’s from the 1950s, but it’s actually from 1986. As recently as a few decades ago, the dolmuş vehicle of choice wasn’t the large yellow van you see today, but classic American cars from the mid-century and pre-war. Some of the vintage cars were customized with a third bench to stuff in more passengers!
Thanks to Turcopedia for the links and info.