KK route is short for a toll-free road of the Tokyo Kōsoku Dōro K.K., separate from the Metropolitan Expressway. Getting on a KK route from the Metropolitan Expressway requires first getting off the Metropolitan Expressway, but every terminus of the KK route is connected to the Metropolitan Expressway. Thus, no base toll is collected when reconnecting to the Metropolitan Expressway from a KK route without getting off onto a local road.
─Map of KK routes
Using a KK route
There are two ways to use a KK route.
1. Pass through a KK route coming from the Metropolitan Expressway, then use the Metropolitan Expressway again
2. Get off the Metropolitan Expressway onto a local road at a KK route exit
Here is a description of the rules for "connection" in (1).
Drivers who passed through using the same ETC card remotely can pass through (1) to (4) below without taking further steps. However, drivers should connect from (2) to (3) within 10 minutes. Another toll will be collected if 10 minutes is exceeded.
