Dr. Diandra: The cars each playoff driver should avoid to survive Bristol

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With only Christopher Bell locked into the next round of the playoffs, the first item on every other drivers’ to-do list is to simply survive Bristol.

The worst thing that can happen to a playoff driver is him taking himself out of the race.

The second-worst thing is for another driver take him out.

During a discussion of accidents on SiriusXM Speedway, host Dave Moody asked if some drivers tend to run into each other more than they run into other drivers.

I suspected they did, but here are the numbers.

The method

Never trust statistics unless you know what data was used, where it came from, and how the claimant arrived at their results.

I started with NASCAR’s caution list, selecting all accidents and spins involving two or more cars. For 2022, that totaled 69 incidents involving 280 cars.

Incidents at road courses, however, often don’t cause cautions. Therefore, I added the list of incidents I compiled from analyzing video of the five road course races. That provided 20 more incidents involving 48 cars.

I then identified all the pairwise correlations. That’s a fancy way of saying I found all the pairs of drivers who were in the same accidents.

For Ross Chastain, for example, I counted how many times the No. 1 car was in an accident that also involved the No. 2 car, the No. 3 car, etc. I repeated this for each driver.

Each pair of drivers’ score is the number of accidents they had in common. These numbers ranged from zero to six.

No analysis is ever absolute. So here are the caveats:

  • Counting accidents is subjective. I may not have counted one or two incidents in the road course races that someone else might. NASCAR didn’t count accidents that didn’t cautions.
  • I haven’t discriminated between two-car incidents and multi-car crashes. They all potentially hamper the driver’s finish. But drivers take two-car altercations a little more personally. They thus get more attention and we remember them better.

Who contacts the most cars?

I start by examining how many pairwise collisions each driver tallied in the 28 races this year. Again, a pairwise collision is simply an accident or spin involving both drivers.

Two of this year’s rookie class rise to the top of the list. Harrison Burton was involved in 75 pairwise interactions and Todd Gilliland in 70.

Being a rookie doesn’t necessarily mean you get tangled up with more cars. Austin Cindric had only 45 pairwise interactions.

The third driver in the overall rankings is veteran Denny Hamlin, with a 66. Aside from Burton, Gilliland and Hamlin, no driver has more than 60 pairwise collisions this year.

Six drivers score between 50 and 59.

Justin Haley holds the lowest score of all full-time drivers at 19. Other low-scoring drivers are:

Specific pairs

If collisions were random, then every car would have about the same pairwise collision score with every other car. We already know not to expect that because where cars typically run influences who collides with whom.

Cars that tend to run at the front of the field are more likely to run into other cars that run at the front of the field. The same holds true for mid-pack and back-of-pack drivers. The only exception is at superspeedways because those crashes tend to collect a broader swathe of positions.

The two drivers involved in the largest number of common incidents this year are Cindric and Burton, with a total of six. One-ninth of Cindric’s incidents included Burton.

But running position can’t entirely explain this data.

Cindric’s average running position is 17.0, which is almost five positions away from Burton’s average running position of 22.9. But playoff driver Austin Dillon has an 18.2 average running position and has no shared incidents with Burton.

Cindric and Dillon have no shared incidents, either.

Running position can, however, explain the other two drivers that have a high score with Burton. Gilliland and Corey LaJoie each have five shared accidents with the No. 21. LaJoie’s average running position is 25.4 and Gilliland’s is 23.5.

But LaJoie has only one shared accident with Gilliland.

If this makes your head spin, the diagram below may help. I denote each driver by his car number. The numbers on the arrows tell you how many shared incidents each pair has.

A graphic showing the numbers of pairwise correlations (i.e. shared accidents) for Harrison Burton and select drivers.

Aside from the Burton/Gilliland and Burton/LaJoie pairings, only two other driver pairs had five mutual encounters. Denny Hamlin shares five accidents each with Elliott and Ryan Blaney.

How to survive Bristol

The table below shows driver pairs with scores of four or more for each of the playoff drivers. These are the cars each driver should avoid if they are to survive Bristol (7:30 p.m. ET Saturday, USA Network.) Austin Dillon, Kevin Harvick, Tyler Reddick, Chase Briscoe, William Byron and Alex Bowman are not included because none had any scores of four or above.A table showing playoff drivers and which cars they most frequently find themselves in accidents with.

Dr. Diandra: How much does Talladega shake up the playoffs?

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Talladega Superspeedway is known for shaking up the playoffs. But how well deserved is that reputation?

Playoff drivers usually view the first race in the second round of the playoffs as the best chance to earn points, earn stage points and maybe even a win given that Talladega is the second race. Now that Texas is in the rear-view mirror, let’s turn our data analysis tools to Talladega.

The shake-up index

Determining how much one race shuffles the playoffs standings requires a simple metric that is applicable to all the years NASCAR has had stages and playoffs. In a rare point of consistency, Talladega has remained the 31st race of the season since 2017, when stage racing started.

After trying a couple different approaches, I finally settled on playoff rankings. These rankings are a zero-sum game. For each driver who moves up a position, another driver must move down.

The first graph is playoff ranking as a function of race for the second playoff segment of 2021. It’s a bit of a mess, but stay with me.

A scatter graph of rank changes to help determine how much shaking-up Talladega actually does

Playoff rank runs along the left side of the graph. The highest ranked driver is at the top and the 12th ranked at the bottom.

The leftmost set of dots shows the rankings coming out of Bristol, after eliminating the lowest four drivers and re-seeding the rest. The second column of dots show the rankings after Las Vegas, which was the first race in the second round in 2021.

Each driver is represented in a different color, with lines connecting his rankings. For example, the dark purple lines show Denny Hamlin rising from third to first over these three races. The light blue lines at the bottom show Alex Bowman plummeting from seventh to 12th.

The messier the lines between two races, the more the playoffs were shaken up. Because it’s hard to quantify “messiness,” I counted each time one driver’s line crossed another driver’s line.

Each crossing indicates two drivers changed places in the rankings. The number of intersections between Bristol and Las Vegas, for example, tells you how much Las Vegas shook up the standings.

Three intersecting lines count as three shake-ups because there are three pairs of drivers crossing.

In 2021, Las Vegas had nine intersections, Talladega 13 and the Roval only five. This seems consistent with our hypothesis that Talladega is the biggest shaker-upper in the second round.

Talladega Timeline

In addition to being only one point, the 2021 Talladega contest poses another problem. Bubba Wallace won the rain-shortened race, which went 311 miles instead of the scheduled 500 miles.

That raises the possibility that 2021 might not be the most representative year for Talladega races. I therefore repeated the analysis going back to 2017. Since we didn’t have stage racing — and thus stage points — before 2017, it doesn’t make sense to compare previous years.

The table below shows the shake-up index from 2017-2021. Note that the first and third races changed from year to year.

A table summarizing the shake-up index for Talladega and other races in the second playoff round from 2017-2021

This five years of data show that Talladega wasn’t always the race that most shook-up this round of playoffs. From 2017-19, Dover and Charlotte held that honor. That’s surprising, especially in 2017. That’s the year 26 of 40 cars failed to finish the Talladega race and NASCAR parked Jimmie Johnson and Matt DiBenedetto.

In 2020, the three races had just about equal shake-up indices.

The Roval has been the third playoff race for only two years. It was equally chaotic with Talladega in terms of affecting the standings in 2020, but less so in 2021. Kansas beat the Roval for switching up the playoff standings twice.

 A caveat for the first race

If you’re surprised to see a larger shake-up for the first race in the second round of the playoffs, you’re not alone.

The 2021 fall Las Vegas race was remarkably uneventful. There were only two DNFs, both non-playoff cars. And one single-car accident that, again, didn’t involve a playoff car. Yet it had a shake-up index of nine.

It turns out that this is a side-effect of the re-seeding protocol.

The graph below shows the same time period as the rankings graph, but reports total points for the top-12 drivers.

A scatter plot showing how points changed for the top-12 playoff drivers in 2021 in the second round of the playoffs

Immediately after re-seeding, the drivers are separated by 57 points from first to 12th. If you omit Kyle Larson’s 30-point lead, the bottom 11 drivers are separated by only 27 points.

Since a driver can earn a maximum of 60 points in a single race, the first race in a round has a lot more impact in changing the standings. In effect, the first race decompresses the re-seeding compression.

After Las Vegas, the 12 playoff drivers were separated by 78 points. After Talladega, the margin grew to 98 points.

The larger numbers for the first races in any round are more due to the re-seeding-induced points compression than to the nature of the track.

Applied to 2022

Drivers don’t have to win at Talladega. They just have to finish ahead of the other playoff drivers. In fact, if a given driver can’t win, the next best case for him is if none of the other playoff drivers win, either.

The largest drop in positions a driver has seen from Talladega is five — and that’s from the rain-shortened 2021 race. On the other hand, drivers have also seen as much as an eight-position gain in the standings following Talladega. That gain was after the 2017 race where more than half the field failed to finish, but at least one driver has come out of the fall Talladega race each of the last four years up at least three positions.

As far as the stats for this year’s second round playoffs so far: Last week’s Texas race had a shake-up index of 14. That’s higher than all but the first year of the stage-racing playoff era.

And the William Byron penalty (which Hendrick Motorsports is contesting) has a shake-up index of seven.

NASCAR weekend schedule for Talladega Superspeedway

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The NASCAR Cup Series playoffs roll into Talladega Superspeedway, a center of uncertainty, for the second race in the Round of 12 this weekend.

Sunday’s race (2 p.m. ET, NBC) could place the first driver in the Round of 8. Any playoff driver who wins the race automatically advances to the next round.

Through the playoffs to date, playoff drivers are batting zero in the race-win category. Non-playoff drivers — Tyler Reddick, Chris Buescher, Bubba Wallace and Erik Jones — have scored wins in the first four playoff races.

Joey Logano leads the playoff points entering the race. Ross Chastain, who won at Talladega earlier this year, is second.

The four drivers below the cutline are Austin Cindric, William Byron, Christopher Bell and Alex Bowman. Byron was above the line earlier this week but was penalized 25 points for spinning Denny Hamlin under caution last Sunday at Texas Motor Speedway. That move lifted Chase Briscoe above the cutline.

Playoff races also are scheduled for the Xfinity Series (Saturday, 4 p.m. ET, USA Network) and the Camping World Truck Series (Saturday, 12:30 p.m., FS1) at Talladega.

Here’s a look at the Talladega weekend schedule:

Talladega Superspeedway (Cup, Xfinity and Truck)

Weekend weather

Friday: Sunny. High of 78.

Saturday: Partly cloudy. High of 74.

Sunday: Intervals of clouds and sun. High of 75.

Friday, Sept. 30

(All times Eastern)

Garage open

  • 9 a.m. – 6 p.m. — Truck Series
  • 10:30 a.m. – 7:30 p.m. — Xfinity Series
  • 2 – 7 p.m. — Cup Series

Track activity

  • 3:30 – 5 p.m. — Truck Series qualifying
  • 5:30 – 7 p.m. — Xfinity Series qualifying (USA Network)

Saturday, Oct. 1

Garage open

  • 8:30 a.m. – 12:30 p.m. — Cup Series
  • 9:30 a.m. — Truck Series
  • 1 p.m. — Xfinity Series

Track activity

  • 10:30 a.m. – Noon — Cup Series qualifying (NBC Sports app, Motor Racing Network, Sirius XM NASCAR Radio)
  • 12:30 p.m. — Truck Series race (94 laps, 250 miles; FS1, Motor Racing Network, SiriusXM NASCAR Radio)
  • 4 p.m. — Xfinity Series race (113 laps, 300 miles; USA Network, Motor Racing Network, SiriusXM NASCAR Radio)

Sunday, Oct. 2

Garage open

  • 11 a.m. — Cup Series

Track activity

  • 2 p.m. — Cup Series race (188 laps, 500 miles; NBC, Motor Racing Network, SiriusXM NASCAR Radio)

Short-track ace Sam Ard shares Xfinity record with Noah Gragson

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Former two-time Xfinity Series champion Sam Ard’s name returned to the forefront in the past week as Noah Gragson tied Ard’s series record for consecutive victories at four.

Although Ard has been nominated for the NASCAR Hall of Fame, his exploits generally aren’t well-known among many who follow the modern sport of stock car racing. He was on the Hall voting list for the 2023 class but was not elected.

In the 1970s and ’80s, Ard was a short-track master in the vein of stars like Jack Ingram, Harry Gant and Butch Lindley, drivers who could show up at virtually any half-mile track across the country and take home the trophy.

He won the NASCAR Late Model (now the Xfinity Series) championship in 1983 and 1984, scoring 18 wins across those two seasons. He put together four victories in a row late in the 1983 season, winning at South Boston, Virginia; Martinsville, Virginia; Rougemont, North Carolina and Charlotte.

Ard was so dominant in 1984 that he had wrapped up the seasonal championship with two races remaining. In 28 series starts that year, he had 24 top-five finishes and 26 top-10 runs. He won eight times.

In the next-to-last race of the 1984 season, at North Carolina Speedway in Rockingham, Ard suffered critical head injuries when his car slid in fluid from another vehicle and hit the track’s outside wall.

That crash effectively ended Ard’s career and impacted the rest of his life. Ard often talked of learning to walk again as part of his recovery. He said he would use a walker in a pile of sawdust in his backyard so that the landing would be softer when he fell.

Ard eventually was diagnosed with Alzheimer’s disease and Parkinson’s disease. In 2006, responding to Ard’s financial problems, drivers Kyle Busch, Kevin Harvick and Dale Earnhardt Jr., among others, launched a drive to raise funds for his family.

Ard, a native of Scranton, S.C., died in April 2017. He was 78.

 

 

 

 

 

Drivers to watch in Cup Series race at Talladega Superspeedway

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The NASCAR Cup Series playoffs will reach a critical point Sunday in a 500-mile chase at treacherous Talladega Superspeedway.

The overriding factor in any race at Talladega, NASCAR’s biggest track, is the unknown. With cars running so fast and so close together, multi-car accidents are not only possible but expected, and it’s easy to become the innocent victim of someone else’s mistake.

MORE: NASCAR penalizes William Byron for spinning Denny Hamlin

The tension is doubled for the 12 playoff drivers. A bad finish at Talladega could open the door for a probable playoff exit at the end of the round Oct. 9 at the Charlotte Motor Speedway Roval.

The playoffs to date have seen four wins by non-playoff drivers, an unprecedented result. Tyler Reddick was the most recent to join that list with a win last Sunday at Texas Motor Speedway.

A look at drivers to watch at Talladega:

FRONTRUNNERS

Denny Hamlin

  • Points position: 6th
  • Last three races: 10th at Texas, 9th at Bristol, 2nd at Kansas
  • Past at Talladega: 2 career wins

Although he hasn’t won, Hamlin has finished in the top 10 in all four playoff races. In the past six races at Talladega, he has four finishes of seventh or better. Now if he can just keep people from running into him…

William Byron

  • Points position: 3rd
  • Last three races: 7th at Texas, 3rd at Bristol, 6th at Kansas
  • Past at Talladega: Best career finish is a second

Byron stands alone as the only playoff driver who has been able to avoid major crashes and trouble in the pits, and he has finished in the top 10 in all four playoff races. After Tuesday’s penalty for his incident with Denny Hamlin at Texas, he sits below the cutline entering Sunday’s race.

Brad Keselowski

  • Points position: 24th
  • Last three races: 8th at Texas, 13th at Bristol, 25th at Kansas
  • Past at Talladega: 6 wins, the active leader

Even in trying times, Keselowski is a threat at Talladega, where he last won in April 2021 (his last Cup victory). He has led 268 laps there in the past 13 races.

QUESTIONS TO ANSWER

Kyle Busch

  • Points position: 15th
  • Last three races: 36th at Texas, 34th at Bristol, 26th at Kansas
  • Past at Talladega: 1 career win, in 2008

Is Busch going to steadily disappear into the mist as he rides out the final weeks of his final year with Joe Gibbs Racing? His best finish in the past four races is 26th. On the positive side this week, he’s the only driver to finish in the top 10 in this year’s three races at Daytona and Talladega.

Chase Elliott

  • Points position: 8th
  • Last three races: 32nd at Texas, 2nd at Bristol, 11th at Kansas
  • Past at Talladega: 1 career win, in 2019

Can Elliott rebound from a fiery finish and a 32nd-place run at Texas? Playoff points give him some comfort, but a second career win at Talladega would be greatly appreciated in the Hendrick camp.

Martin Truex Jr.

  • Points position: 17th
  • Last three races: 31st at Texas, 36th at Bristol, 5th at Kansas
  • Past at Talladega: Best career finish is 5th

Will one of the sport’s most enduring mysteries continue at Talladega? In 70 career starts at Daytona and Talladega, Truex, a former champion and a smooth driver, has zero wins. At Talladega, he has only three top-five finishes in 35 starts.