Duncanville is a city located in Dallas County, Texas. It is a suburb of Dallas and is part of the Dallas-Fort Worth metroplex. The city was named after its founder, Crawford Trees Duncan, who purchased the land in 1880. Duncanville started off as a small farming community and has grown steadily over the years. Today, it is a thriving city with a population of over 39,000 residents.

Freight transportation plays a significant role in Duncanville's economy. The city is strategically located near major highways and interstates, including Interstate 20 and U.S. Route 67, making it an ideal location for transportation and logistics companies. The proximity to these transportation routes allows for efficient movement of goods and products, benefiting both local businesses and the overall economy of the city. Duncanville is also served by the Dallas Area Rapid Transit (DART) system, providing convenient public transportation options for residents and visitors.

Carlsbad, California, is a beautiful coastal city located in San Diego County. It is known for its stunning beaches, upscale resorts, and charming village atmosphere. Carlsbad is also home to one of the largest desalination plants in the United States, which provides a significant portion of the city's water supply. This plant uses advanced technology to convert seawater into fresh water, ensuring a reliable source of water for residents and businesses in Carlsbad.

In terms of freight transportation, Carlsbad benefits from its proximity to major transportation routes. The city is located near Interstate 5, which is a major north-south highway that stretches from the Mexican border to the Canadian border. This makes it easy for goods and products to be transported in and out of Carlsbad. Additionally, Carlsbad is served by the nearby McClellan-Palomar Airport, which provides convenient air cargo services for businesses in the area.