wireless data link. The location of the vehicles is not tracked during a reservation for privacy reasons but is trackable, and all cars are equipped with a "kill" function that allows the company to prevent the car from starting in the event of theft. Zipcar also offers the embedded Information Technologies it has installed in its fleet as a fleet optimization service through its FastFleet service. During a rental, a Zipcar member can interface with their rented vehicle using the Zipcar smartphone app, which includes the ability to locate the vehicle in a parking lot (including GPS location and the ability to sound the vehicle's horn and flash the lights) and unlock or lock the vehicle. Clean fuel vehicles Among its fleet of fuel-efficient vehicles, and through an agreement between Honda and Zipcar, the program offers clean fuel and low-emission vehicles that include the Insight hybrid, Civic Hybrid, and Honda Fit EV all-electric car. Vehicles such as the Chevrolet Volt and Toyota Prius are also available. Zipcar Flex In the United Kingdom, some vehicles are branded "Zipcar Flex" which means that they can be left anywhere within a designated zone, rather than in a specific parking space. The remaining vehicles are branded "Zipcar Roundtrip". Common vehicles in the Zipcar fleet Sedan Toyota Corolla (sedan) Chevy Malibu Ford Focus (sedan) Ford Fiesta (sedan) Nissan Sentra Honda Fit Honda Civic (sedan) VW Jetta Hyundai Elantra Kia Forte Subaru Impreza (sedan) Hatchback VW Golf Kia Soul Subaru Impreza (hatchback) Honda Civic (hatchback) Mazda 3 (hatchback) Ford Fiesta (hatchback) Luxury Mercedes-Benz C-Class BMW X3 Mercedes-Benz GLC SUV Kia Sorento Mitsubishi Outlander Honda CR-V Subaru Crosstrek Mazda CX-5 Kia Sportage Honda HR-V Toyota 4Runner Ford Escape Ford Edge Nissan Rogue Jeep Wrangler Toyota RAV4 Hyundai Santa Fe Pickup Truck Nissan Frontier Minivan Honda Odyssey Toyota Sienna Dodge Grand Caravan Cargo Van Ford Transit Expansion On October 31, 2007, Zipcar and Flexcar announced their intentions to merge. The merged company retained the name "Zipcar" and was headquartered in Cambridge, Massachusetts. Zipcar's chief executive, former Seattle-based Boeing engineer Scott Griffith, became Chairman and CO, while Flexcar CEO Mark Norman became president and Chief Operating Officer. The merger combined Zipcar's fleet of 3,500 vehicles in 35 markets with Flexcar's 1,500 cars in 15 markets. In December 2009, Zipcar announced their participation in a round of financing with Avancar, the largest on-demand car rental company in Spain, based in