Tesla S awarded 5 star safety rating

model s crash tested

Independent testing by the United States National Highway Traffic Safety Administration (NHTSA) has awarded the Tesla Model S a 5-star safety rating, not just overall, but in every subcategory without exception. Approximately one percent of all cars tested by the federal government achieve 5 stars across the board. NHTSA does not publish a star rating above 5, however safety levels better than 5 stars are captured in the overall Vehicle Safety Score (VSS) provided to manufacturers, where the Model S achieved a new combined record of 5.4 stars.

Of all vehicles tested, including every major make and model approved for sale in the United States, the Model S set a new record for the lowest likelihood of injury to occupants. While the Model S is a sedan, it also exceeded the safety score of all SUVs and minivans. This score takes into account the probability of injury from front, side, rear and rollover accidents.

The Model S has the advantage in the front of not having a large gasoline engine block, thus creating a much longer crumple zone to absorb a high-speed impact. This is fundamentally a force over distance problem — the longer the crumple zone, the more time there is to slow down occupants at g loads that do not cause injuries. Just like jumping into a pool of water from a tall height, it is better to have the pool be deep and not contain rocks. The Model S motor is only about a foot in diameter and is mounted close to the rear axle, and the front section that would normally contain a gasoline engine is used for a second trunk.

For the side pole intrusion test, considered one of the most difficult to pass, the Model S was the only car in the “good” category among the other top one percent of vehicles tested. Compared to the Volvo S60, which is also 5-star rated in all categories, the Model S preserved 63.5 percent of driver residual space vs. 7.8 percent for the Volvo. Tesla achieved this outcome by nesting multiple deep aluminum extrusions in the side rail of the car that absorb the impact energy (a similar approach was used by the Apollo Lunar Lander) and transfer load to the rest of the vehicle. This causes the pole to be either sheared off or to stop the car before the pole hits an occupant.

The rear crash testing was particularly important, given the optional third row children’s seat. For this, Tesla factory installs a double bumper if the third row seat is ordered. This was needed in order to protect against a highway speed impact in the rear with no permanently disabling injury to the third row occupants. The third row is already the safest location in the car for frontal or side injuries.

The Model S was also substantially better in rollover risk, with the other top vehicles being approximately 50 percent worse. During testing at an independent facility, the Model S refused to turn over via the normal methods and special means were needed to induce the car to roll. The reason for such a good outcome is that the battery pack is mounted below the floor pan, providing a very low center of gravity, which simultaneously ensures exceptional handling and safety.

Of note, during validation of Model S roof crush protection at an independent commercial facility, the testing machine failed at just above 4 g’s. While the exact number is uncertain due to Model S breaking the testing machine, what this means is that at least four additional fully loaded Model S vehicles could be placed on top of an owner’s car without the roof caving in. This is achieved primarily through a center (B) pillar reinforcement attached via aerospace grade bolts.

The above results do not tell the full story. It is possible to game the regulatory testing score to some degree by strengthening a car at the exact locations used by the regulatory testing machines. After verifying through internal testing that the Model S would achieve a NHTSA 5-star rating, Tesla then analyzed the Model S to determine the weakest points in the car and retested at those locations until the car achieved 5 stars no matter how the test equipment was configured.

The Model S lithium-ion battery did not catch fire at any time before, during or after the NHTSA testing. It is worth mentioning that no production Tesla lithium-ion battery has ever caught fire in the Model S or Roadster, despite several high-speed impacts. While this is statistically unlikely to remain the case long-term, Tesla is unaware of any Model S or Roadster occupant fatalities in any car ever.

The graphic below shows the statistical Relative Risk Score (RSS) of Model S compared with all other vehicles tested against the exceptionally difficult NHTSA 2011 standards. In 2011, the standards were revised upward to make it more difficult to achieve a high safety rating.

five star test results

Share:

More Posts

tesla cybertruck production

Tesla Q1 Deliveries

Q1 Deliveries 8.5% drop Y on Y Tesla reported first-quarter vehicle deliveries of 386,810, a drop of 8.5% from the same quarter last year. Estimates compiled by FactSet, analysts were expecting deliveries of around 457,000 for the first three months of the year. This is Tesla’s first year-over-year decline in deliveries since 2020. Stock drops 5%

Tesla 3 and Y

Tesla March 2024 UK price update – No change

Tesla Model 3 and Model Y pricing remain unchanged during March 2024, making 11 months of no increase to UK retail pricing. Model 3 price reduced by £3,000 during October 2023. Model 3 base price remains at £39,990 and Model Y at £44,990. Model Y available at £399 / month Great deal for deliveries before

Solar PV Production march 2024

242 kWh Produced March 2024 – Spring starts to arrive with a number of sunny days generating over 10 KWH with a few grey days giving virtually nothing in terms of solar production. Still mighty wet. The total for the month is more in line with expectations. Total production of 244 KWH. Also new Solar

Solar PV Production Feb 2024

82 kWh Produced Feb 2024 – a grey month that only produced 82 KWh just over half the 2023 Feb results.  So much for Global warming – all we have is cloud. Solar production to date 2024 and 2023 Shows the dismal Feb 24. See complete Solar Project details with year to date data: Full

Send Us A Message