[All] [Shocking] Where did Ryoko Hirosue's rear-end collision occur? A thorough investigation into why there weren't even any brake marks left!

In April 2025, a high-speed rear-end collision involving Ryoko Hirosue occurred inside a tunnel on the Shin-Tomei Expressway. We will provide a detailed analysis based on media reports, including where the accident occurred, why the car was traveling at speeds exceeding 180 km/h, and the background to the police's decision to refer the case to prosecutors on the 13th.

 

 

table of contents 1. Where did Ryoko Hirosue's accident occur? A complete look at the scene 2. Why was the car speeding over 180 km/h? Mysterious behavior before and after the accident 3. Post-accident response: The process from on-site investigation to arrest and release 4. Reasons for the referral of documents and future prospects 5. Comparison table summarizing the site and circumstances 6. Why did the accident happen now? Experts' opinions 7. Q&A: Frequently asked questions about Ryoko Hirosue's accident

 

1. Where did Ryoko Hirosue's accident occur? A complete look at the scene

Ryoko Hirosue's accident occurred inside the Awagatake Tunnel on the Shin-Tomei Expressway (inbound) in Kakegawa City, Shizuoka Prefecture. On April 7th, Hirosue's car rear-ended a large truck in front of it while traveling through the tunnel. The impact caused the vehicle to hit the wall, and the recoil caused it to bounce into the passing lane, where it came to a halt. This area is known for its poor visibility and for being a place where speeding can easily lead to serious accidents. Just before the accident, Hirosue and her male passenger switched drivers at the Hamamatsu Service Area (Hamamatsu SA). The investigation included an on-site investigation of the driving conditions from the SA to the tunnel.

 

 

 

 

2. Why was the car speeding over 180 km/h? Mysterious behavior before and after the accident

 

According to investigators, Hirosue's car was likely traveling at an "abnormal speed" of over 180 kilometers per hour, and there were almost no clear brake marks left at the scene. The police initially considered filing charges of dangerous driving resulting in injury, but because it was difficult to determine whether the highway environment constituted a "high speed that was difficult to control," they ultimately changed their policy to refer the case to prosecutors on suspicion of negligent driving resulting in injury. On the day of the accident, Hirosue was observed to be behaving "unusually," such as yelling, but drug tests did not detect any illegal drugs such as marijuana or stimulants.

 

 

 

 

3. Post-accident response: The process from on-site investigation to arrest and release

 

After the accident, Hirosue was transported to a hospital in Shimada City, where he was arrested on the spot for kicking a nurse and scratching her arm, causing injuries. However, nine days later, he was released with charges pending. He later announced that he had been diagnosed with bipolar disorder and hyperthyroidism. On July 28, approximately three months after the accident, on-site inspections were conducted in his presence at both Hamamatsu SA and Awagatake Tunnel. Investigators carefully examined the situation, and Hirosue explained what happened at the time from inside the car.

 

 

 

 

4. Reasons for the referral of documents and future prospects

 

Based on an on-site investigation and multiple voluntary interviews following the accident, Shizuoka Prefectural Police are expected to refer Hirosue to the prosecutor's office on November 13, 2025, on suspicion of negligent driving resulting in injury. To summarize the series of events, this accident was a serious one, involving a rear-end collision at extremely high speed, no brake marks, and multiple collisions with walls, and the investigating authorities are expected to decide on a final disposition (fines or prosecution) within the year.

 

 

 

 

5. Comparison table summarizing the site and circumstances

●Basic information about the accident\

item	Content
Date and time of the accident	April 7, 2025
place	Awagatake Tunnel on the Shin-Tomei Expressway (Kakegawa City, Shizuoka Prefecture)
The last stop	Shin-Tomei Expressway Hamamatsu Service Area
driving speed	Over 180 km/h
Accident type	Rear-end collision with a large trailer and multiple contact with walls
passenger	Male (injury, fracture, etc.)

●Investigation and Disposition Process

season	Content
April 7	Accident → Arrested red-handed for assaulting a nurse at a hospital
April 16	Released pending prosecution
July 28	On-site inspection with the driver present (Hamamatsu SA, Awagatake Tunnel)
Scheduled for November 13th	Indicted on suspicion of negligent driving resulting in injury

 

 

 

6. Why did the accident happen now? Experts' opinions

 

According to lawyer Masaru Wakasa, former deputy chief of the Tokyo District Public Prosecutors Office's Special Investigation Division, on-site investigations of traffic accidents often take time, and an on-site investigation three months later cannot be said to be particularly late, depending on various conditions such as the physical condition and situation immediately after the accident, the status of the settlement, etc. Furthermore, although there is a high possibility that the injury case with the nurse will not be prosecuted due to the settlement, the investigation into the traffic accident itself needs to continue, which is said to have led to the decision to refer the documents to the prosecutor's office.

 

 

 

 

7. Q&A: Frequently asked questions about Ryoko Hirosue's accident

Q1. Where was the accident? What was the exact location?
A1. It is located inside the Awagatake Tunnel on the eastbound Shin-Tomei Expressway in Kakegawa City, Shizuoka Prefecture.

 

 

Q2. Why was the speed over 180 km/h?
A2. The reason has not been officially revealed, but according to investigation documents, there were few brake marks, suggesting the possibility of distraction or operating error.

 

 

Q3. Why was the case not found to be dangerous driving resulting in injury?
A3. It is difficult to prove the "difficulty in controlling" speed standard on expressways, and as a result the charge was changed to negligent driving resulting in injury.

 

 

Q4. What will happen to the disposal in the future?
A4. The prosecutor's office is expected to make a final decision on the matter within the year, and it has been pointed out that a fine or prosecution is possible.

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