Between Jan. 15 and Feb. 4, The Korea Times conducted field tests of KT's WiMax service around Seoul. Testers used a Lenovo laptop PC and a finger-sized modem that comes with the WiMax subscription for free. The WiMax modem was plugged into a USB port of the laptop, and the green light started to blink in about 10 seconds to indicate it went online. The test vehicle hit the Seoul-Busan expressway, the main artery of South Korea, from its starting point near Hannam Bridge to Pangyo exit near Bundang, about 30 kilometers south of Seoul. To see whether the network works constantly, testers launched a real-time Web broadcasting channel of MBC TV, which requires a high-speed Internet connection for viewing. The result was almost flawless. During the 20-minute journey, the TV streaming had only two brief interruptions, each of them lasting less than one second. It actually seemed like a problem of the broadcasters' network, not WiMax's, because the Internet connection of the laptop remained online.