Introduction - The COVID-19 pandemic forced France into a strict lockdown from March 17 to May 10, 2020. While traffic accidents and traffic fatalities dropped sharply during this period, what about the number of injured people and the severity of their injuries? The objective is to assess the impact of the lockdown on traffic-related morbidity. Method - The data are drawn from the Registry of Road Traffic Accident Victims in the Rhône department. The main characteristics of the accident, the victim, and the severity of injuries during the lockdown period are compared to the same period the previous year. However, to avoid attributing to the lockdown effects linked to other sources of variation in accident rates, the same analysis is performed on the period preceding the lockdown. All periods are selected to have the same duration as the lockdown itself. The analyses are descriptive and univariate. Results - This lockdown period is associated with a 75% decrease in the number of victims (386 vs. 1,537 the previous year). There is also a higher proportion of cyclists among victims and a lower proportion of motorists (to the point of being roughly equal in number), more single-vehicle accidents, an increase in the male-to-female ratio, a relative excess of victims under 14 and a relative deficit of those aged 15–24, a smaller proportion of victims with minor injuries (and more with moderate injuries), and a lower proportion of victims with cervical spine injuries. Discussion-Conclusion - The lower proportion of motorists involved in accidents during lockdown explains the lower proportion of accidents involving another party. These two phenomena combined explain the lower number of victims per accident and the lower proportion of cervical spine injuries. The increase in the male-to-female ratio primarily concerns those aged 25–44. This may reflect a different way of coping with the imposed constraints (domestic and otherwise). The relative excess of victims under 14 is linked to the increase in cycling by children who are still inexperienced, particularly girls. The relative decrease in victims aged 15–24 is linked to reduced use of bicycles and scooters. Finally, the decrease in the proportion of those with the least severe injuries could be explained by reduced use of the healthcare system during lockdown. However, this decline contributes only marginally to the dramatic drop in accident rates during this period. Thus, beyond a significant reduction in road accidents, this strict lockdown revealed characteristics of accidents and victims that suggest, overall, a shift in travel toward more sustainable modes of transport. This shift, and its specific accident rates, will need to be assessed over the longer term.