Large airports have become to be built far in the distance of cities in Japan. In such cases, the noise duration increases because of the increases of aircraft altitude in residual areas although the noise level is reduced. Therefore it possibly provides some problems to evaluate the aircraft noise independently of environmental noise when the frequency of flight is large.
The purpose of this study is to find the way to evaluate the effect of aircraft noise on the environmental noise level considering the flight frequency on the basis of quantitative relationship between the noisiness and loudness of environmental noise clarified as well as that of aircraft noise in the distance.

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The replotting system is the process of replotting an area for land readjustment work. The feedback of the system is managed between the proportionate method of replotting design and estate estimate. But it is suggested that there is a feedback connection between the control element and the system's attributes.
The optimization of the replotting system is acquired by the control element.

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This study considers the equilibrium demands forecasting model of car and transit and its practical application method.
A binary mode choice/assignment combined model was formulated using a variational inequality by Florian. His model assumes that factors contributing to mode and route choice are same and their weights are given in advance.
From these findings, Florian's model is reformed so as to be applicable to the cases where the factors contributing to both choice processes partially differ in combination. A method is also developed, which simultaneously determines the weights of mode choice factors and equilibrium traffic flows by mode using practically observable demand data.

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This paper proposes a modal describing human behavioral process in response to fare change for long distance trips. A liner learning model is modified and applied to time-series data of the modal split. The model parameters and outcome derived from the model show good correspondence with the fare change, so the model produces good indices representing human evaluation of fare change.

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This paper presents a method of land-condition mapping by overlaying the land-cover information derived from Landsat multispectral scanner (MSS) data with the land-conditions obtained from the existing surveys. It also examines the applicability of the method to land-use planning and the revision of land-use restriction. A land-condition map for housing is drawn validly and practically on the basis of results obtained from the multivariate analysis. It is found that the map agrees with the one made by the experts, and fundamental information on the urbanization of cities can be derived timely, widely and periodically.

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As well known, there are considerable numbers of energywise and soil-engineeringwise problems in the conventional snow-removal and snow-melting systems by means of gasoline-mobile machineries and by utilizing warm-under-ground water.
To overcome above the problems, the sonw-conveyance-gutter systems and the snow melting-gutter systems by utilizing surface water have become the tow principal items as the effective and practical countermeasures.
However, the standard-design methods of them have not yet been established. The snow-transportation capacity of the snow-conveyance-gutter systems was discussed in our previous paper. In this paper, the snow-melting capacity of the snow-melting-gutter systems by means of surface water is made clear and the standard-design methods of the systems are discussed.

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The purpose of this paper is to develop an estimation model of trip generation and modal split, based on an analysis of travel patterns in business trip chaining behaviours. From an empirical analysis for the daily travel pattern and modal split, it is obtained that the ratio of a car-use tends to become larger with increasing the number of sojourns in a business trip chain. The model proposed here incorporates such a characteristic into modal split decision-making, by improving the existing trip chaining model for an estimation of business trip generation. Through its application, it can be found that this model is useful for representing the interaction between business trip chaining behaviour and modal split in a single day.

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In this paper, a method of calculation is proposed to determine the optimum offsets of coordinated traffic signals so as to minimize the total traffic delay on a street. The optimization technique employed is dynamic programming. The platoon is supposed to be represented by a single rectangle and to be dispersed as it travels. The method is programmed for the numerical computation. The optimum offsets can be obtained for a streets under the arbitrary road and traffic conditions. Some examples are worked out.
Furthermore, it is shown that, by using the same method as mentioned above, bandwidth-maximizing offsets can be obtained under the condition of no dispersion of platoon and no traffic delay, and that the bandwidth is equal to maximum platoon length.

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Expressway networks in great urban areas are often tied-up with increasing traffic demands with many larger commercial vehicles. The traffic conditions are preventing the expressway networks to keep their function of rapid and steady transport. Investigations are now being given to bottleneck sections on expressway to improve the situation. This report describes an analytical method and traffic survey to determine the necessary merging section length which appears on an improvement project for the Meishin Expressway near the Tennozan and Kajiwara Tunnel.

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Environmental countermeasures for road traffic noise should be, in general, performed at the area not only on the road side but also around road. Therefore, installation of the buffer building due to the low for Improvement of the Areas along Trunk Roads is one of the important technique to reduce road traffic noise. In this report, the simple acoustic model of buildings, which is able to calculate the characteristics of noise propagation around buildings, was proposed, as calculate points are placed at the rear area of the large building. And the availability of the suggested prediction method was confirmed by field measurements of some places. Then, the characteristics of road traffic noise were revealed under some values on size of the building, arrangement of buildings and gap in two buildings. It will make the most use for executing the environmental improvement for road traffic noise in future.

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