In what was an absolutely dominating performance from Team Penske, Brad Keselowski led 199 of the 267 laps to win the Quaker State 400 at Kentucky Speedway.

Following the Daytona 500 in February, 2,400 ft (730 m) of additional SAFER barriers were added to the circuit, in order to improve safety.

"We're always looking at ways to enhance our safety and it is a priority for us," said Lenny Santiago, senior director of public relations for Daytona International Speedway.

"Whenever we have an incident on track, we always take a look in consultation with NASCAR, the University of Nebraska and other experts that are a part of the Motorsports Technology Group and take their recommendations.

[14] David Gilliland won the pole with a lap time of 45.531 and a speed of 199.322 mph (320.778 km/h) after only one round of knockout qualifying was completed due to weather.

Biffle retook the lead on lap 86, before the start of the pit cycle, coming under green flag conditions.

The race restarted on lap 98 and the fifth caution flew for another multi-car wreck on the back straightaway collecting 26 cars.

Busch even joked around while being upside down on his radio saying "Just having a good old time over here" with his spotter responding "Just hanging around?".

The cars involved in the wreck were Kasey Kahne, Greg Biffle, Joey Logano, Cole Whitt, Kyle Busch, Clint Bowyer, Alex Bowman, David Gilliland, Justin Allgaier, Ryan Newman, Paul Menard, Josh Wise, Michael Annett, Ryan Truex, Bobby Labonte, Matt Kenseth, Landon Cassill, Jamie McMurray, Marcos Ambrose, David Ragan, Denny Hamlin, Danica Patrick, Brad Keselowski, Terry Labonte, Reed Sorenson, and Michael McDowell.

Gilliland described the incident as "all heck broke loose all at once", while Kyle Busch had driven through the grass before his car dug in and sent him back towards traffic; he described his roll as "real slow", After 4 minutes and 48 seconds, the red flag was lifted and the field continued under caution.

Almirola's victory was the first for a car numbered 43, since John Andretti did so in the 1999 Goody's Body Pain 500 at Martinsville Speedway.

[20] The infraction was a P2 level penalty and a violation of section 12-1 (actions detrimental to stock car racing) and 20–12 (l) (for events at Daytona International Speedway and Talladega Superspeedway, at all times, the Delta (or difference) of the Z-height measurement between the center of the panhard bar mounting bolt located at the left truck trailing arm and the center of the panhard bar mounting bolt, located at the right rear sub-frame mounting bracket, must not exceed three inches) of the 2014 NASCAR rule book.