Discussion and Conclusion Spot Speed Study PDF

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DISCUSSIONOur study was done along the road of Multilane Highway Puncak Perdana. The study was involved 100 vehicles. We have done the observation by shooting the vehicles using the radar gun. Based on Garber and Hoel, speed characteristics can be found from the significant values during the observa...

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DISCUSSION Our study was done along the road of Multilane Highway Puncak Perdana. The study was involved 100 vehicles. We have done the observation by shooting the vehicles using the radar gun. Based on Garber and Hoel, speed characteristics can be found from the significant values during the observation. These values are average, median, modal, percentile, pace and standard deviation of speed. Based on the calculation, it can be found that the arithmetic mean speed is 73.15 km/hr. Meanwhile, the median speed is 70.8694 km/hr which is obtained from the cumulative frequency distribution curve. Next, the mode speed is 63 km/hr. The standard deviation has been calculated by using its respective formula and found to be 11.672 km/hr. However, the data by using Microsoft Excel, it can be obtain that the mean is 72.59 km/hr which is is quite low compare than using the calculation while the median speed is 72 km/hr. The median speed is also known as the 50 th percentile speed. At the 15th, 85th and 98th – percentile speeds are 59.5 KPH km/hr, 86.5 KPH km/hr and 96.5 KPH km/hr respectively. Next, the standard deviation is around 11.4036 km/hr. The term ‘pace’ refers to the range of speed which shows the biggest number of observations. In our observation, a set of speed between 40 km/hr to 104.9 km/hr. Thus, we decided to use an interval of 4.9 km/hr. The pace is (70-74.9) km/hr shows the highest number of observations. The standard error that is allowed in the experiment is 1.1672. The adequacy of data for 95% confidence significant level is found to be between 72.9623 km/hr and 77.5377 km/hr. When selecting a location and layout, care must be exercised so that any vertical reference posts can be seen clearly by the observer. Next, the observer should be positioned higher than the study area and be looking down and the position could be on a bridge or a roadway back slope. Then, the observer should use reference points to aid in collecting the elapsed time it takes a vehicle to travel through the study area. After that, the reference point to start timing may be a brightly coloured vertical post and also the reference point to end timing may be a tree or a signpost in the observer’s sight line. Last but not least, an accurate sketch of

the site should be documented, including number of lanes, position of observer, and description of our points. There are a few precautions we must take note when conduct the experiment. The distance between the radar speed meter and the vehicles that pass-through must be not too far so that it will not affect the reading. The reading is affected when the car pass through the bumper which cause the car to slow down the speed. Our position must be higher than the study area so that it is easier to take accurate reading.

CONCLUSION As a conclusion, it can be stated that the speed distributions of the vehicle along with our study locations have been observed through spot speed study. In this experiment, we achieved the objectives of the experiment which is the data were collected using a radar gun method. From the result analysis, the maximum speed on the road is within the range of speed from 100km/hr to 104.9 km/hr. The drivers almost do not exceed this speed. The percentile distribution speed can be found by plotting another graph of cumulative frequency versus mean speed and from there, we get the value of P15, P85 and P98 which are 59.5km/hr, 86.5km/hr, and 96.5km/hr. Then, it can also be observed that there are slightly differences in values and maybe happen some negligence in conducting the experiments. Refer to the Traffic Rules and Regulations for Students in Malaysia especially for speed limit, in the state roads area the speed limit is 60-90 km/hr.

REFERENCES Mughda P (n.d) Spot Speed Studies in Traffic Engineering: Endoscope, Measurement and https://www.engineeringenotes.com/transportationMethods Retrieved from engineering/traffic-engineering/spot-speed-studies-in-traffic-engineering-endoscopemeasurement-and-methods/48389 Priyansh Singh (5 October 2016) Spot Speed Study (Lab) Retrieved from https://www.slideshare.net/PriyanshSingh1/spot-speed-study-lab Prof. Tom V. Mathew (10 January 2019) Measurement over a Short Section Lecture Notes in Transportation Systems Engineering Retrieved https://www.civil.iitb.ac.in/tvm/nptel/522_TrSpeed/web/web.html

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