PURPOSES : This study introduces the use of instantaneous speed collected by in-vehicle sensing devices for space mean speed and time mean speed estimation.
METHODS : Using probe vehicles’ instantaneous speed data and GPS location at each designated time interval enables analysts to calculate the link-based space mean speed and time mean speed for a certain time-space domain directly. This study proves the equations mathematically and compares the results of time mean speed using Wardrop’s equation and section average speed by trips.
RESULTS : This study introduces the concept of link-based average speed using both time mean and space mean speed definitions. First, an unbiased space mean speed was explained for a roadway section can be calculated from high-resolution vehicle trajectory data without necessarily continuously tracking a vehicle. Second, this study proves that the average section speed by occupancy resulted in identical values to the true space mean speed formulation by Wardrop. In addition, the average section speed by trip was nearly identical to the time mean speed.
CONCLUSIONS : Each section on a signalized intersection corridor yielded various speed distributions whose parameters varied as measurements were taken closer to the intersection proper. By exploring the space mean speed with speed distribution, the intersection impact area can be defined more accurately.

ABSTRACT
1. 서론
    1.1. 논문개요
2. 연구배경 및 목적
    2.1. 연구의 배경
    2.2. 연구의 목적
3. 연구의 내용 및 범위
4. 데이터 수집 및 정보화
    4.1. 데이터 수집 장비
    4.2. 데이터 수집 장소 및 방법
    4.3. 통행속도 분석
    4.4. 구간별 속도 분석 결과
    4.5. 교차로 운영에 따른 영향권
5. 결론
REFERENCES

• 김상기(한국지방행정연구원 지방투자사업관리센터) | Kim Sangkey 교신저자