November sales for Infiniti, Nissan's luxury  brand, were up 10.5 percent compared to a year ago, and now the company has another reason to celebrate: The 2014 Infiniti Q50 and Q50 Hybrid midsize sedans have both earned five-star overall safety ratings from the National Highway Traffic Safety Administration.

The 2014 Infiniti Q50. (Infiniti Motor Company Ltd.)

In addition to the five-star overall score, which is the highest score possible, the Q50 and Q50 Hybrid earned four-star frontal crash test ratings and five-star ratings for side crash tests and rollover protection. NHTSA explains that the agency "created the 5-Star Safety Ratings Program to provide consumers with information about the crash protection and rollover safety of new vehicles beyond what is required by Federal law. One star is the lowest rating; five stars is the highest. More stars equal safer cars."

The Insurance Institute for Highway Safety hasn't yet tested the Q50 or Q50 Hybrid. Both are new models for 2014.

“We’re pleased with NHTSA’s recognition of Infiniti’s efforts to develop some of the safest cars on the road,” says Infiniti Americas Vice President Michael Bartsch. “The Q50 offers elegant design, inspired performance and ‘Five-Star’ safety."

Other upscale midsize cars from the 2014 model year that have earned five-star overall safety ratings from NHTSA include the Audi A4, BMW 3-Series and 3-Series Hybrid, Buick Regal, Cadillac ATS, Cadillac CTS, Chevrolet Volt, Lexus ES and ES Hybrid, Lexus IS, Lincoln MKZ and MKZ Hybrid, Mercedes-Benz C-Class and Volvo S60.

In the market for a new car? Check out the U.S. News rankings of this year’s best cars. Then, look for a great deal on a new vehicle by checking out this month’s best car deals. Also, be sure to follow us on Twitter and Facebook.