Consultants were selected using the Technique in the surveying method of Moving Car speed by making the traffic flow along with the recording time and the distance from the beginning point or the major intersection along the way, and the end of the path. By using the method of detecting the actual speed that the car can travel on the road. The trial, in which the car ran a survey was made to install a device (GPS Tracking) to remove the saved data to calculate the average speed to find the journey of each road. Explore this journey speed had made the test for 2-9 range of June 5 on the road and 2558 (2015) contains. Highway 4, Highway numbers, land, land, land, Highway No. 41 No. 401, and Highway No. 403 land. The average speed on the survey results on the project area's Highway network in the presently stood at approximately 71-83 km/hr. The survey found that by the average speed on highways, in the land of no. 4 and 41 range province prachuap khiri Khan. To Nakhon SI thammarat (4 road traffic), which runs parallel to the railroad route of the project concept. The average speed is about 96 km/hr. Best Highway No. 4 to Chumphon province via a range of Phang-Nga province, Ranong. The average speed decreased approximately 75 km/hr the rest come. because most of the route is along a 2-channel traffic and certain is he that has a slope (range from Chumphon to Ranong with 4 channels of traffic, and is expanding to 4 traffic) by the results of a survey on the travel speed of the highway are the values shown in table 8 and Figure 3.2-3.2-4.
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