Counting the places in Matsuyama with the most accidents, from public data (2019-2025)

Matsuyama had 7,363 accidents in 7 years. Here are 12 squares of 1 km on a side

In Counting Ehime’s traffic accidents from public data, we counted 15,873 accidents in Ehime Prefecture from 2019 to 2025, using the National Police Agency’s traffic accident statistics open data (main table). In the same count, the rows with Matsuyama’s municipality code add up to 7,363 over the 7 years. That is 46.4% of the prefecture total (calculated; the summary data we publish has the city and town breakdown for 2025 only).

This page takes the “0.01-degree grid squares” made in that count and lists the 12 squares in Matsuyama with the most accidents, in order of count. A square is about 1.1 km in latitude and about 0.9 km in longitude at this latitude. The count is the total of the accidents inside the square. From map data (OpenStreetMap), we added the names of roads that pass through or along the edge of each square, and the names given to traffic lights.

• The counts are the values in /data/ehime-accidents.json, which we used for the count. We did not count again.
• The total of the top 12, and the shares of the prefecture and the city, are calculated for this page.
• Squares ranked 13th and below are not listed.
• From this data, we cannot tell whether an accident happened on those roads or at the intersections with those traffic lights. The names from the map data only show what is in the area of the square.

The top 12 squares, in order of count

Rank	Center of square (north latitude, east longitude)	Accidents (total for 2019-2025)
1st	33.835, 132.775	321
2nd	33.835, 132.755	226
3rd	33.845, 132.755	214
4th	33.825, 132.775	209
5th	33.825, 132.785	202
6th	33.855, 132.755	200
7th	33.845, 132.775	198
8th	33.825, 132.755	185
9th	33.835, 132.765	183
10th	33.835, 132.785	169
11th	33.815, 132.795	165
12th	33.825, 132.745	160

The top 12 add up to 2,432 accidents. That is 15.3% of Ehime Prefecture’s 15,873 and 33.0% of Matsuyama’s 7,363 (both calculated). For all 12 squares, the municipality code of every row in the square was Matsuyama.

Each square extends 0.005 degrees north and south and 0.005 degrees east and west of its center. For example, the 1st square is from 33.830 to 33.840 degrees north latitude and from 132.770 to 132.780 degrees east longitude.

Road and traffic light names in each square’s area

For roads from the map data, we list the main roads that pass through the square or along its edge (some city roads are left out). Road numbers are the numbers written in the map data. “Names given to traffic lights” are only the traffic light points that have a name in the map data. Traffic lights without a name are not included.

1st: 321 accidents (center 33.835, 132.775)

• Roads in this area in the map data: National Route 11 (国道11号, partly named Katsuyama-dori), Matsuyama-Kawauchi Line (松山川内線, number 334), Chifunemachi-Takaoka Line (千舟町高岡線), Niban-cho Line (二番町線), Sanban-cho Line (三番町線), Yasaka Route 1 (八坂1号線)
• Names given to traffic lights: Kawaramachi (河原町), Okaido Koban-mae intersection (大街道交番前交差点), Tsukiyama intersection (築山交差点), Tachibana 1-chome intersection (立花1丁目交差点)

2nd: 226 accidents (center 33.835, 132.755)

• Roads in this area in the map data: National Route 56 (国道56号), National Route 196 (国道196号), Matsuyama Airport Line (松山空港線, number 18), Matsuyama-Masaki-Iyo Line (松山松前伊予線, number 326), Ozu Kaido (大洲街道), Sanban-cho Line, Chifunemachi-Takaoka Line
• Names given to traffic lights: Kitafujiwara (北藤原), Saibi High School-mae (済美高校前), Fujiwara 2-chome (藤原2丁目), Takehara intersection (竹原交差点), Nishihoribata intersection (西堀端交差点)

3rd: 214 accidents (center 33.845, 132.755)

• Roads in this area in the map data: National Route 196, Matsuyama Port Line (松山港線, number 19), Miyanishi Bridge (宮西橋, number 19), Ozu Kaido, Honmachi-Asami Line (本町朝美線), Chuo Junkan Line (中央循環線)
• Names given to traffic lights: Honmachi 3-chome (本町3丁目), Homukyoku-kita (法務局北), Matsuyama Station-mae (松山駅前), Shiroyama Koen-guchi (城山公園口), Fudanotsuji (札ノ辻), Honmachi 4 (本町4), Nishihoribata intersection, Heiwadori 6-chome (平和通6丁目)

4th: 209 accidents (center 33.825, 132.775)

• Roads in this area in the map data: National Route 33 (国道33号), Matsuyama Minami Road (松山南道路), Matsuyama Ring Road South (松山環状線南部)
• Names given to traffic lights: Amayama (天山)

5th: 202 accidents (center 33.825, 132.785)

• Roads in this area in the map data: National Route 11, National Route 33, Matsuyama Ring Road East (松山環状線東部), Matsuyama Ring Road South, Matsuyama-Kawauchi Line (number 334)
• Names given to traffic lights: Kosaka (小坂)

6th: 200 accidents (center 33.855, 132.755)

• Roads in this area in the map data: National Route 196, Rokkenya-Ishite Line (六軒家石手線, number 187), Matsuyama Port Line (number 19), Nanboku Route 73 (南北73号線)
• Names given to traffic lights: Shobokyoku-mae (消防局前), Chuo 1-chome (中央1丁目), Honmachi 5-chome (本町5丁目), Rokkenya (六軒家)

7th: 198 accidents (center 33.845, 132.775)

• Roads in this area in the map data: National Route 11, National Route 317 (国道317号), Matsuyama-Hojo Line (松山北条線, number 20), Matsuyama-Kawauchi Line (number 334), Niban-cho Line, Chuo Junkan Line, Ropeway Street (ロープウェー街; named Ichiban-cho Shinonome Line, 一番町東雲線, in the map data)
• Names given to traffic lights: Nishi-Ichiman (西一万), Kami-Ichiman (上一万), Ichiban-cho (一番町), Ichiban-cho 2-chome (一番町2丁目), Konohana-cho intersection (此花町交差点), Katsuyama (勝山)

8th: 185 accidents (center 33.825, 132.755)

• Roads in this area in the map data: National Route 56, Matsuyama Airport Line (number 18), Matsuyama-Masaki-Iyo Line (number 326), Matsuyama-Iyo Line (松山伊予線, number 16), Matsuyama Ring Road West (松山環状線西部; including sections named Izumi Viaduct, 和泉高架橋, and Izumi Bridge, 和泉大橋), Ishii Route 60 (石井60号線)
• Names given to traffic lights: Izumi-kita (和泉北), Izumi (和泉), Saikan Daiichi Pedestrian Bridge (西環第一歩道橋), Yushin Junior High School-mae (雄新中学校前), Oguri (小栗), Kuko-dori Iriguchi (空港通入口)

9th: 183 accidents (center 33.835, 132.765)

• Roads in this area in the map data: National Route 56, National Route 11, Matsuyama City Station Line (松山市停車場線, number 191), Chifunemachi-Takaoka Line, Sanban-cho Line
• Names given to traffic lights: Shiyakusho-mae (市役所前), Minami-horibata (南堀端), Nichigin-mae (日銀前), Muromachi intersection (室町交差点), Kenritsu Chuo Hospital-mae (県立中央病院前)

10th: 169 accidents (center 33.835, 132.785)

• Roads in this area in the map data: Matsuyama Ring Road East, Matsuyama-Kawauchi Line (number 334), National Route 11
• Names given to traffic lights: (In the map data, there are no traffic light points with a name. There are 4 traffic light points without a name.)

11th: 165 accidents (center 33.815, 132.795)

• Roads in this area in the map data: National Route 11, Kume-Habu Line (久米垣生線, number 190), Matsuyama-Kawauchi Line (number 334)
• Names given to traffic lights: (In the map data, there are no traffic light points with a name. There are 2 traffic light points without a name.)

12th: 160 accidents (center 33.825, 132.745)

• Roads in this area in the map data: Matsuyama Airport Line (number 18), Matsuyama-Masaki-Iyo Line (number 326), Matsuyama Ring Road West (including sections named Doida-higashi Overpass, 土居田東跨線橋, and Doida-nishi Overpass, 土居田西跨線橋), Yugun Route 148 (雄郡148号線), Yugun Route 28 (雄郡28号線)
• Names given to traffic lights: Kuko-dori 2-chome (空港通2丁目), Saikan Daini Pedestrian Bridge (西環第二歩道橋)

The “points” on this page are, in each square, the named traffic light closest to the center of the square (not counting those named after a pedestrian bridge). The 10th and 11th squares have no named traffic lights, so their points are the centers of the squares. The points are in order of count, not driving order. “Start” only means the square ranked 1st by count, and “goal” only means the one ranked 12th. This is not a route that goes through them in order.

What the Ehime Prefectural Police say

What we can read from the numbers goes only as far as which areas have a high count. The reasons, and which intersections have more, cannot be told from this data. The Ehime Prefectural Police have published the following about intersections. This is one sentence from a Prefectural Police flyer (no issue date is written on it; it was on the Prefectural Police website on October 13, 2026).

◆　県警では、交通事故の約半数が交差点で発生している実態を踏まえ、交差点違反（交差点優先車妨害、信号無視、一時不停止等）の取締りを強化しています。

Translation: “◆ Based on the fact that about half of traffic accidents happen at intersections, the Prefectural Police are stepping up enforcement of intersection violations (obstructing a vehicle with priority at an intersection, ignoring traffic lights, failing to stop at a stop sign, and so on).”

Source: （いけんよ!!“伊予の早曲がり”は危険な交通違反です！、PDF、愛媛県警察） (checked on October 13, 2026)

We read the original text of this flyer, and of the Prefectural Police’s advice on right turns and crosswalks, in What the Ehime Prefectural Police ask drivers to watch for on Ehime roads.

The Ehime Prefectural Police also publish a “Traffic Accident Map” (交通事故マップ) where you can see on a map where accidents happened.

身近で発生している交通事故・・・いつ、どこで、どのような事故が 発生しているのか是非一度確認し、交通事故防止に役立ててください。

Translation: “Traffic accidents that happen close to you… Please check once when and where, and what kind of accidents are happening, and use it to help prevent traffic accidents.”

Source: 愛媛県警察 ／ 交通事故マップ (checked on October 13, 2026)

How we counted, and what we cannot tell

• We converted the latitude and longitude, given in degrees, minutes, and seconds of the world geodetic system in the National Police Agency’s code table, to decimal degrees, and divided them into 0.01-degree squares. The steps are described in more detail in the article for all of Ehime Prefecture.
• We have not checked for small differences (a difference in geodetic systems) between the latitude and longitude in the accident data and the positions in the map data.
• This data does not include the traffic volume, road length, number of traffic lights, or road structure of each area. From this data, we cannot tell what causes a high count.
• The squares are divided by evenly spaced lines of latitude and longitude. They do not line up with the borders of intersections or road sections.
• The National Police Agency writes that the data at the time of publication may change with later corrections, and that it does not fix the published data when that happens, so it may differ from the statistical tables it publishes separately.

Sources and processing

The accident counts on this page were made by Ehime Michishirube, who counted data published by the National Police Agency. The road and traffic light names are from OpenStreetMap (© OpenStreetMap contributors, ODbL) map data, which Ehime Michishirube looked up. The National Police Agency’s terms of use say this about using content that has been edited or processed:

コンテンツを編集・加工等して利用する場合は、上記出典とは別に、編集・加工等を行ったことを記載してください。なお、編集・加工した情報を、あたかも国(又は府省等)が作成したかのような態様で公表・利用してはいけません。

Translation: “When you edit or process the content and use it, state that you edited or processed it, separately from the source above. Do not publish or use the edited or processed information in a way that makes it look as if the national government (or a ministry or agency) made it.”

Source: 利用規約｜警察庁Webサイト (checked on October 13, 2026)

Following this rule, we state the following.

Source: Made by Ehime Michishirube, who extracted and counted the Ehime Prefecture data from “Traffic Accident Statistics Open Data” (交通事故統計情報のオープンデータ, National Police Agency). The total of the top 12 and the shares on this page are Ehime Michishirube’s calculations.