This study aimed to analyze the impact of implementing a voluntary driver's license return program on reducing traffic crashes for older drivers who were previously involved in traffic accidents. The traffic crashes caused by elderly drivers were categorized by crash type. We used the Chi-square test to compare municipalities that implemented the program in 2019 and 2020 with those that did not and explored variations in crash types based on the residential areas and age groups of elderly drivers. The voluntary driver's license return program reduced considerably the number of single-vehicle crashes involving elderly drivers. Moreover, while all crash types decreased in rural areas, only pedestrian–vehicle, and single-vehicle crashes were reduced considerably in urban areas. In terms of age groups, drivers aged >75 years were associated with reduced numbers of crashes (all types). Similarly, the 70–74 age group demonstrated considerable reductions in pedestrian–vehicle and single–vehicle crashes, emphasizing the importance of encouraging and supporting license returns among these age groups. First, because the characteristics of each crash type vary, it is important to analyze the impact of voluntary driver’s license returns on crash reduction, with a focus on specific crash types. Second, voluntary license returns should be promoted in all regions. However, in rural areas with limited access to public transportation, mobility must be supported by the introduction of DRT. Third, given that drivers aged >75 years were associated with reduced numbers of crashes (for all types of crashes), priority policies should be implemented to encourage license returns within this age group, along with tailored incentives. However, as the voluntary license return program is intended to support selfinitiated cessation of driving without compulsion, strategies should also be explored to promote voluntary returns without age restrictions. Fourth, a standardized evaluation system should be established to enable older drivers to assess their driving abilities and physical conditions, further encouraging voluntary license returns.

ABSTRACT
1. 서론
2. 선행연구 고찰
3. 고령자 운전면허 자진반납과 고령 운전자 교통사고 현황
4. 분석 방법 및 이용 데이터
5. 운전면허 자진반납이 고령 운전자 교통사고유형에 미치는 영향
6. 결론
REFERENCES

• 이동윤(한국교통연구원 도로교통연구본부 주임연구원) | Lee Dong-youn
• 홍다희(서울시립대학교 교통공학과 연구교수) | Hong Dahee (Research Professor Department of Transportation Systems Engineering, University of Seoul 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul, 02504, Republic of Korea) Corresponding author