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The main purpose of collectors in a roadway network is to link local roads to arterials. Collectors serve as vital connectors that gather traffic from local streets or neighborhoods and funnel it toward the larger arterial roads. This function is essential for providing access to residential areas while also directing traffic efficiently toward major thoroughfares without overwhelming them. Collectors are designed to handle moderate traffic volumes and provide essential connectivity that ensures a seamless flow from local traffic to the higher-capacity arterial roads, which are designed to carry longer trips and higher speeds.

This role is crucial in an overall transportation system, as it helps to organize traffic flows, reduce congestion on local streets, and ensure that residents have suitable access to major routes for commuting and services.