specifications similar to those of Lotus Elise and Porsche Cayman. The production of MXT started in January 2011. In 2010, Mexican bus maker Cimex announced that it was expanding into the passenger vehicle field and was developing a pickup truck called the Conin which would be Mexico's first domestic pickup truck when expected to enter production in 2013. To date, 42 makers have official representation in the country with nearly 400 different models, making Mexico one of the most varied automotive markets in the world. The automotive sector accounts for 17.6% of Mexico's manufacturing sector. Mexico is the second largest automobile manufacturing nation in the Western Hemisphere, after the United States, having produced 4 million vehicles in 2017. The industry produces technologically complex components and engages in research and development. The "Big Three" (General Motors, Ford and Chrysler) have been operating in Mexico since the 1930s, while Volkswagen and Nissan built their plants in the 1960s. In Puebla alone, 70 industrial part-makers cluster around Volkswagen. In the 2010s, expansion of the sector was surging. In 2014, more than $10 billion in investment was committed in the first few months of the year. Kia Motors in August 2014 announced plans for a $1 billion factory in Nuevo León. At the time, Mercedes-Benz and Nissan were already building a $1.4 billion plant near Aguascalientes, while BMW was planning a $1-billion assembly plant in San Luis Potosí. Additionally, Audi began building a $1.3 billion factory near Puebla in 2013. Of the Mexican car exports to the US, most are carried by rail, and some by sea. Vehicle use restrictions In Mexico City the "Hoy no circula" ("Cannot be driven today") program is implemented. Every vehicle has a color sticker depending on the ending number of its plate, as well as a number to determine its pollution rate. Brand new cars "00" and recent models "0" are exempt; "Hoy no circula" only applies to vehicles older than 8 years, which have "1" and "2" designations. The program works by removing these vehicles from circulation one day during the week, and recently one Saturday per month, depending on their last license plate digit number. Said limitations occur as follows: Plates ending with 5 or 6 (yellow) cannot be driven on Mondays and the 1st Saturday of the current month. Plates ending with 7 or 8 (pink) cannot be driven on Tuesdays and the 2nd Saturday