What is the percentage of vehicle traffic that collectors carry?

Answer: B — 15%

The percentage of vehicle traffic that collectors typically carry is often around 15%. Collectors serve a vital role in the roadway system; they facilitate the connection between local streets and arterial roads. As intermediaries, they manage the flow of traffic from residential neighborhoods to larger roads, thereby helping to distribute vehicle traffic efficiently across the network. This percentage is indicative of their function, as collectors are designed to carry a moderate volume of traffic compared to local streets, which have lower traffic volumes, and arterial roads, which handle a larger proportion of traffic. While the specific percentages can vary based on geographical location and urban planning standards, 15% serves as a common benchmark in traffic engineering and municipal planning.