APRON
Brian and Scott know not to clip the apron - the flat part of the track below the banking - at high speed unless they want to upset their Red Bulls. The apron is used for evasive maneuvers, as a safe place for disabled machines and helps cars leaving the pits smoothly rejoin the race.

BANKING
The slope angle of a track's turns, which helps cars maintain their momentum when turning left lap after lap. Bristol Motor Speedway's 36-degree banking is the steepest in all of NASCAR.

BLACK FLAG
Not good. Avoid this flag at all costs. Getting black-flagged either means your car is junk or NASCAR is none too happy with your in-race conduct.

BLEND LINE
There's no re-entering the race after a pit stop until you've cleared this line, which usually ends past the exit of turn two. A car is gaining speed at this point and ready to re-join traffic.

CAMRY
The sleek and sexy model that Toyota fields in Sprint Cup and the Nationwide Series. Two steps down the NASCAR ladder is Toyota's Tundra.

CAR OF TOMORROW
Designed to improve safety, increase competition and cut costs, the COT is the future of NASCAR racing. It carries a splitter on the front and an unsightly looking wing on the rear. Adjustable components are another key ingredient. Regardless of its boxier appearance, drivers say they're as safe as they've ever been.

CATCH FENCE
Curious onlookers (a.k.a. race fans) wouldn't be safe from the action if it weren't for this. Many a time a catch fence has kept flying parts and pieces from entering the grandstands.

CAUTION
Slow down! There's trouble somewhere on the track - anything from the Big One at Talladega to a Jacques Debris sighting in turn three. Whenever this yellow flag waves, the running order is immediately frozen by high-tech scoring loops hiding around the track.

CHECKERED FLAG
We all want to be the first car to cross under this piece of black and white fabric. When this flag waves, the day is done.

COMMIT CONE
If your car desires service, you had better peel off onto pit road before you reach this object coming off turn four. It's easily recognizable by its bright orange color. Once you've passed it, there's no turning back.

DARLINGTON STRIPE
A rite of passage at Darlington Raceway. Scrape the wall a few times with the right side, and a rookie has earned his stripes. Rarely does one stripe come without another.

DIRTY AIR
It's not really dirty. In fact, you can't even see it. It's a slang term, and dirty simply means turbulent air currents that can cause a car to lose control.

DRAFT
Picture two cars running nose to tail. The lead car moves the air in front and provides a cleaner path and less resistance for the trailing car, which, in turn, helps push the car ahead. This aerodynamic effect allows two or more cars to run faster than a single machine - especially at Daytona and Talladega. Look out when four or five cars get to drafting.

ESSES
A series of right and left turns, one right after the other, that are best navigated in the straightest line possible. Only road courses can say they have esses.

FLAG STAND
The perch above the start-finish line where a NASCAR official conducts the starts and stops of a Sprint Cup race. The green and checkered flags, and the rest of the flag family, wave from here.

FREE PASS
When the first car one lap down gets a lap back after the caution flag waves. Also known as the "lucky dog" rule. Being granted a free pass can save your day.

GREEN FLAG
Ol' D.W. has monopolized this moment. As Darrell Waltrip belts "Boogity! Boogity! Boogity!," Brian and Scott hear "Green! Green! Green!" The waving of the green flag symbolizes the start - and any ensuing restarts - of a race.

HAPPY HOUR
Time's up. The last official practice session before the race. Also known as final practice.

INNER LOOP
At Watkins Glen International, this tricky series of turns - turns five, six, seven and eight - tests a driver's mettle under braking on entry and acceleration on exit. The inner loop is a prime spot for passing.

LOOSE
When rear tires have trouble sticking in the corners. A loose condition often is described as being squirrelly. When a car's "way loose," the front end turns, but the unstable rear end slides up the banking. Think oversteer, but being a little loose isn't all that bad, though.

LUCKY DOG
See "free pass."

MARBLES
Even Goodyear's best rubber is prone to breaking apart from time to time under high-speed stress. The end result is marbles, or tiny remnants of tires that have gathered to find a new home against the wall and out of the racing groove. Marbles fall into the "loose stuff" category.

MOORESVILLE
The hometown of Red Bull Racing. Commonly referred to as "Race City U.S.A.," Mooresville rests along the shores of Lake Norman - about 25 miles north of downtown Charlotte.

NASCAR
Short for National Association for Stock Car Auto Racing. "Big Bill" France Sr. founded the sanctioning body in 1948 in Daytona Beach, Fla., where its headquarters still stand today. NASCAR evolved from the beach into America's No. 1 spectator sport.

PIT ROAD
Where crews live, work and service cars for about four hours each weekend. Usually, this stretch of pavement adjacent to the frontstretch begins off turn four and ends entering turn one. But at some smaller tracks, space limitations demand the backstretch have its own pit road.

PIT STALL
Three of four tires must be in this rectangular-shaped space along pit road when Red Bull Racing services one of its Camrys. Some refer to it as a pit box, and each team gets its own during the race.

RED BULL
The reason we're all here. Red Bull is the Austrian energy drink company that owns and sponsors Red Bull Racing's two entries in Sprint Cup.

RED BULL RACING TEAM
The two-car Sprint Cup team that fields Toyota Camrys for Brian Vickers and Scott Speed.

ROAD COURSE
A rarity in Sprint Cup. This type of track - there are two of them on the entire circuit, one in Watkins Glen, N.Y., and the other in Sonoma, Calif. - requires a driver to turn right as well as left and totals far more than four turns.

RUMBLE STRIPS
Red and white-colored curbing that lets a driver know he's coming a little too close to redefining the term "off course." However, if navigated correctly, rumble strips can be a driver's best buddy when trying to keep momentum.

RUNOFF AREA
A place you don't want to be. If you've found your way here, things aren't going well. But a disabled car can find peace in the gravel.

SAFER BARRIER
Short for Steel and Foam Energy Reduction. Many a driver is happy and healthy since "soft walls" were installed at most tracks. Rather than kissing concrete at bone-jarring speeds, SAFER barriers help absorb dangerous deceleration forces and keep the crash's energy away from the driver. It still hurts, just not as much.

SCUFFS
Tires that have been briefly used and saved for later racing. A lap or two at speed is enough to "scuff" a set. Scuffs sometimes help in qualifying.

SPOTTER
A driver's second set of eyes, even though this person is sometimes hundreds of yards away atop some type of structure above the race track. A spotter's job, via radio, is to alert his driver of what's happening before it happens.

START-FINISH LINE
It all begins and ends right here.

STICKERS
Brand-new tires that still have the Goodyear sticker affixed to the tire's contact surface. Nearly all tires used in competition are stickers. After all, they're the newest and last the longest.

TIGHT
When front tires have trouble turning in the corners. A tight car has a hard time maintaining its racing line, as the entire car drifts toward the wall. Think understeer. Tight ain't good, and the condition adds unwanted tenths to lap times.

TIRE BARRIER
The day has turned rather sour if a car finds itself up close and personal with a tire barrier, which eases the impact should a driver stumble off course. Stacks of useless rubber strung together make up a tire barrier.

TOYOTA
The newest of four manufacturers. The Japanese automaker first went Craftsman Truck racing in 2004, but 2007 was its first year in Sprint Cup.

TRADING PAINT
Two cars fighting for the same piece of real estate have been known to trade paint. Or maybe when one driver's a little ticked off at another. Either way, trading paint is commonplace when full-bodied cars compete.

TRD
Short for Toyota Racing Development. They're the brains behind the brawn under the hood.

WIDE OPEN
When a car can't go any faster. Also known as flat out, full throttle or pedal to the metal.

YELLOW LINE
The subject of NASCAR president Mike Helton's stern warnings during driver's meetings at Daytona and Talladega. Invisible everywhere else, the yellow line is an out-of-bounds line at the two restrictor-plate tracks. No driver is allowed to advance his position by going below the yellow line.