PURPOSES : Because elderly drivers are more prone to becoming confused when approaching an urban intersection and thus may yield prolong judgment and decision times than non-elderly drivers, to increase the comfort and safety of the intersection environment for elderly drivers, this study applied autonomous driving tests at an urban intersection to examine their driving characteristics. METHODS: To obtain a more comprehensive understanding of driving features, this study collected drive data of non-elderly drivers and elderly drivers via an autonomous experiment using OBD2 and an eye-tracker, in addition to performing a literature review on the measured visibility range of elderly drivers at intersections. This literature review was conducted considering the general knowledge of elderly drivers having relatively reduced visibility. Additionally, as they are commonly more vulnerable, this study analyzes characteristics of elderly drivers as compared to those of non-elderly drivers. CONCLUSIONS: The results of this study can be summarized as follows: 1) the peripheral visible distance of elderly drivers is reduced as compared to that of non-elderly drivers; 2) elderly drivers approach and proceed through intersections at slower speeds than non-elderly drivers; and 3) elderly drivers yield increased driving distances when performing a right or left turn as compared to non-elderly drivers as a result of their reduced speed and acceleration and larger turning radii relative to non-elderly drivers.

본 연구에서는 야생동물위치추적기(WT-300)을 이용하여 국내에 월동․번식하는 흰뺨검둥오리의 하루 동안 서식지 이용과 이동거리를 파악하여, 우리나라 수조류 서식지 보호․관리의 기초자료로 활용하고자 하였다. 대상지역은 경기도 안성천, 충청남도 봉선저수지, 전라북도 만경강, 동진강, 전라남도 해남군 등 5개 하천과 저수지로 흰뺨검둥오리 20개체 에 위치추적기를 부착하였다. 흰뺨검둥오리는 월동기에 내륙수를 47.3%의 비중으로 가장 많이 이용하였으며, 다음으로 논, 해양수, 내륙습지, 연안습지 등이었다. 내륙수는 시간에 관계없이 꾸준히 이용하였다. 논은 야간에 주로 이용하였고, 내륙습지, 연안습지, 해양수의 경우 주간에 주로 이용하였다. 서식지 이용률 변화는 16시와 18시, 06시와 08시에 가장 컸다. 전체 평균 이동거리는 0.75±0.27㎞/2hours이었으며, 누적 이동거리는 8.95㎞이었다. 06시에서 08시, 16시에 서 18시에 이동한 거리는 2㎞이상으로 가장 길었다. 그 외 시간에는 1㎞미만의 이동거리를 보였다. 장거리를 이동한 시간은 서식지 이용률의 변화 폭이 가장 큰 시간과 일치하였다.

PURPOSES: This study devotes its energies to estimate greenhouse gas emissions for types of horizontal highway designs. METHODS: This paper suggested two types of road scenarios, scenario 1 is made by the lack of road design consistency. Beside scenario 1, scenario 2 is made by good road design. For comparisons of greenhouse gas emissions, driving simulator was used. RESULTS: Emission rates of road scenario 1 are 1.4 times higher than scenario 2 in the driving simulator. CONCLUSIONS : This study may have important implications for contributing to the application of road alignment technology for reduction of greenhouse gases as quantifying the correlations between greenhouse emissions and various road alignments. Consequently, this study will help road designers determine which roads are best alternatives in the process of choosing the roads in the future in terms of environmental benefits.

PURPOSES: Previous Speed Profile reflects the patterns of speeds in sections of tangents to curves in the roads. However these patterns are uniform of speeds and Acceleration/Deceleration. In oder to supplement these shortcomings. this study made a new profile which can contain factors of Acceleration/Deceleration through theories of Previous Speed Profiles. METHODS : For sakes, this study developed the speed prediction model of Rural Multi-Lane Highways and calculated Acceleration/Deceleration by appling a Polynomial model based on developed speed prediction model. Polynomial model is based on second by second. Acceleration/Deceleration Profile is developed with the various scenarios of road geometric conditions. RESULTS: The longer an ahead tangent length is, The higher an acceleration rate in curve occurs due to wide sight distance. However when there are big speed gaps between two curves, the longer tangent length alleviate acceleration rate. CONCLUSIONS: Acceleration/Deceleration Profile can overview th patterns of speeds and Accelerations/Decelerations in the various road geometric conditions. Also this result will help road designer have a proper guidance to exam a potential geometric conditions where may occur the acceleration/deceleration states.