ThatCarHitMe.com
An Injuria.ai Company
YEAR-OVER-YEAR CRASH REPORT · MONTGOMERY, MD · NOVEMBER 2021
Purpose: Machine-readable JSON endpoint for AI agents, LLMs, researchers, and programmatic consumers. Returns all underlying crash data and AI-generated commentary without HTML.
Authentication: None required. Public endpoint.
GET: https://thatcarhitme.com/api/crash-data/reports/data/maryland/statewide/november-2021-report
Monthly Traffic Safety Analysis
901 CRASHES IN
MONTGOMERY, MD
NOVEMBER 2021
In November 2021, Montgomery County recorded 901 total crashes, a 30.2% increase from the 692 crashes reported in November 2020. Despite this rise in overall collisions, the number of fatalities decreased from 7 to 4 year-over-year. The most significant trend was the overall increase in crash volume, which was accompanied by a 10.3% rise in total injuries.
901
▲ 30.2%was 692
Total Crash Events
4
▼ -42.9%was 7
Persons Killed
278
▲ 10.3%was 252
Persons Injured
196
▲ 42.0%was 138
Hit-and-Run Crashes
Note: "Persons Killed" (4) counts individual fatalities across all crash events. "Fatal" in the severity table below (5) counts crash events where at least one fatality occurred. A single crash can result in multiple fatalities. 3 crashes with unreported severity are not shown in the severity breakdown.
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Aggregate counts from crash, person, and vehicle records
Trend Summary
Crash incidents in Montgomery County rose significantly in November 2021 compared to the same month in the prior year. Total crashes increased by 30.2%, from 692 to 901. This upward trend was also reflected in total injuries, which grew by 10.3% from 252 to 278, although fatalities declined from 7 to 4.
196
Hit-and-Run Crashes — November 2021
▲ 42.0% vs prior (138)
Hit-and-run incidents increased notably in November 2021 compared to the previous year. The number of hit-and-run crashes rose from 138 to 196, a 42.0% increase. The hit-and-run rate, which measures the proportion of all crashes that are hit-and-runs, also trended upward, increasing from 19.9% in November 2020 to 21.8% in November 2021.
Vulnerable Road User Casualties
2
Pedestrians Killed
0
Cyclists Killed
2
Motorists Killed
0
Other Killed
37
Pedestrians Injured
3
Cyclists Injured
237
Motorists Injured
1
Other Injured
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Mode classified from person records (driver/passenger → motorist; pedestrian; bicyclist → cyclist; in-line skater / unspecified → other)
When Crashes Happen
The temporal patterns of crashes showed some shifts between the two periods. The peak day for crashes moved from Monday (122 crashes) in November 2020 to Tuesday (165 crashes) in November 2021. However, the peak hour for collisions remained consistent at 5 p.m. in both years, with the number of crashes during this hour increasing from 66 to 75.
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Crash date field aggregated by weekday
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Crash time field aggregated by hour (0-23)
Crash Severity Breakdown
While total crashes increased, the overall severity of crashes decreased year-over-year. The fatal crash rate dropped from 1.01% in November 2020 to 0.55% in November 2021, with total fatalities falling from 7 to 4. The proportion of crashes resulting in serious injury also decreased from 2.3% to 1.8%, while crashes with no reported injuries rose from 68.4% to 73.4% of the total.
Severity is per crash event (most severe injury). 5 fatal crash events resulted in 4 persons killed.
Outcome by Severity (Crash Events)
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · KABCO injury classification scale
Severity Distribution (Crash Events)
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Most severe injury per crash record
Top Contributing Factors
A comparison of contributing factors shows shifts in the leading causes of crashes. The count of crashes attributed to 'RAIN, SNOW, WET' conditions decreased from 45 in November 2020 to 32 in November 2021, a 28.9% drop in count. Conversely, crashes associated with 'N/A, WET' conditions increased from 23 to 32 incidents, a 39.1% rise in count. Crashes involving animals also saw an increase, rising from 10 to 14 incidents year-over-year.
Officer-Reported Primary Contributing Cause
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Officer-reported primary contributory cause per crash
Road & Environmental Conditions
The majority of crashes in both periods occurred in clear weather on dry roads. In November 2021, 78.6% of crashes happened in clear weather, up from 74.0% in the prior year. Crashes during daylight hours increased as a proportion of the total, accounting for 53.6% of incidents compared to 49.0% in November 2020. The share of crashes on wet road surfaces saw a slight decrease, from 11.6% in 2020 to 9.7% in 2021.
Weather
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Weather condition at time of crash
Lighting
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Lighting condition field
Road Surface
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Road surface condition field
Vehicles & Demographics
Top Vehicle Makes (1,566 vehicles)
Source: Montgomery County Crash Reporting (ACRS) · Socrata Open Data · 2021-11-01 to 2021-11-30 · Vehicle unit records
Data Sources & Methodology
Primary Data Source
All crash data in this report is sourced from Montgomery County Crash Reporting (ACRS) (https://data.montgomerycountymd.gov/d/bhju-22kf), accessed programmatically via the Socrata Open Data API (SODA). This dataset contains official police-reported motor vehicle traffic crash records maintained by the reporting jurisdiction's law enforcement agency. Records are published to the open data portal by the municipality and are subject to the portal's terms of use.
Data Retrieval
- Access method: Socrata Open Data API (SoQL queries)
- Dataset URL: https://data.montgomerycountymd.gov/d/bhju-22kf
- Data format: Structured JSON via REST API
- Record types queried: Crash events, person records, and vehicle unit records
- Date filter applied: 2021-11-01 through 2021-11-30
- Report generated: September 9, 2026
Data Coverage
- Reporting period: 2021-11-01 through 2021-11-30 (30 days)
- Geographic scope: montgomery, MD
- Total crash records analyzed: 901
- Total persons involved: 1,620
- Total vehicles involved: 1,566
Analytical Methodology
- Severity classification: Uses the KABCO injury scale (K=Fatal, A=Incapacitating injury, B=Non-incapacitating injury, C=Possible injury, O=No injury/property damage only), the standard classification in U.S. Model Minimum Uniform Crash Criteria (MMUCC). Severity is assigned per crash event based on the most severe injury in that crash. A single fatal crash (K) may involve multiple fatalities; therefore the "Persons Killed" count in the headline KPIs may differ from the "Fatal" crash count in the severity breakdown.
- Contributing factors: Reflect the officer-determined primary contributory cause recorded at the time of the crash report. These are preliminary determinations and may not reflect final investigation findings.
- Hit-and-run classification: Based on the hit-and-run indicator field in the official crash report, as determined by the responding officer at the scene.
- Temporal analysis: Day-of-week and hour-of-day distributions are computed from the crash date/time timestamp in each record.
- Demographics: Age and sex distributions are drawn from person-level records linked to each crash event. A single crash may involve multiple persons.
- Vehicle data: Make information is drawn from vehicle unit records linked to each crash event.
- AI commentary: Narrative sections are generated by Google Gemini (large language model) based on the structured data. Commentary is descriptive, not predictive, and should not be interpreted as expert opinion.
Limitations & Disclaimers
- Only crashes reported to and documented by law enforcement are included. Minor incidents, unreported crashes, and near-misses are not captured in this dataset.
- Data reflects conditions at the time of the initial police report and may be subject to subsequent corrections, reclassifications, or supplements by the reporting agency.
- Open data portal records may experience a publication lag - recently occurring crashes may not yet appear in the dataset at the time of report generation.
- AI-generated commentary is produced by a large language model and is intended to highlight patterns in the data. It does not constitute legal, medical, or professional analysis.
- Percentages are calculated from reported data and are subject to rounding.
Non-Affiliation Disclosure
This report is produced independently by ThatCarHitMe.com (Injuria.ai). It is not affiliated with, endorsed by, or produced in partnership with any law enforcement agency, municipal government, state department of transportation, or the National Highway Traffic Safety Administration (NHTSA). Data is sourced from publicly available government open data portals.
Data License
The underlying crash data is provided under the municipality's Open Data Terms of Use and is made available to the public for unrestricted use. This analysis and report is © 2026 Injuria.ai and may be cited with attribution using the suggested citation below.
Corrections & Feedback
If you believe any data in this report is inaccurate or have questions about our methodology, please contact: data@injuria.ai. We are committed to accuracy and will issue corrections promptly.
Suggested Citation
ThatCarHitMe.com (Injuria.ai). "montgomery, MD Crash Intelligence Report: November 2021." Published September 9, 2026. Reporting period: 2021-11-01 to 2021-11-30. Data source: Montgomery County Crash Reporting (ACRS), Socrata Open Data. Dataset: https://data.montgomerycountymd.gov/d/bhju-22kf. Available at: https://thatcarhitme.com/crash-data/maryland/statewide/november-2021-report
About the Publisher
ThatCarHitMe.com is a crash data intelligence platform developed by Injuria.ai, a legal technology company specializing in traffic safety analytics. We aggregate and analyze publicly available government crash data to produce structured intelligence reports for communities, researchers, journalists, and legal professionals. Our reports combine programmatic data retrieval from official open data portals with AI-assisted narrative analysis.
Questions about this report's data or methodology: data@injuria.ai
ThatCarHitMe.com · An Injuria.ai Company
ThatCarHitMe.com
An Injuria.ai Company
Crash Data Intelligence
Data: Montgomery County Crash Reporting (ACRS) · Socrata
Period: 2021-11-01 – 2021-11-30
Generated: September 9, 2026 · All rights reserved