Collector-Distributor Road
A collector-distributor road runs parallel to the main travel lanes of a highway and connects it to frontage roads or entrance ramps. Collector-distributor roads are found at interchanges and allow motorists to bypass a traffic signal by driving under the intersecting road, much like an underpass.
Illustration: Collector-Distributor Roads
Photograph: Collector-Distributor Roads
Source: The image above illustrates the key components of Collector-Distributor Roads.
A. Freeway mainlanes
B. Collector-Distributor road
C. Crossing road
TxDOT Visual Dictionary