Good afternoon sir; I am watching your lectures regularly. Simultaneously I am taking the help of textbook for improving the knowledge in subject area. I promise you sir that, with this video lectures I will explore the knowledge and try to transform the same to my maximum students. Also, inform to the students about the link. Thanks for shearing the video lectures. The lectures are very interesting with practical knowledge. Dr. Prashant P Nagrale Professor & Dean finance Department of Civil Engineering Sardar Patel College of Engineering Andheri west, Mumbai - 58. 🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻
Thank you for uploading the lecture on Level of Service. May I request you to elaborate or clarify the following: 1. Distribution curve of speed difference (SD). How intersection of normal curve and histogram gives the maximum observed SD for highway. 2. Plot between Gap value and Cumulative distribution of Non-Followers. Possibly, an equation between NF and CG would also be useful. May also like to see that in the solution of example as per HCM(2016), ATS by graph appears to be 55 mph, giving PFFS=91.6% or LOS of B. Kind regards
Thanks Mr. Gupta for watching the video. My response to your comments is given below. 1. US HCM defines a follower if the gap between two vehicles is 3 sec or less, and a vehicle moving in free flow condition is this gap is more that 10 sec. It does not consider speed difference as the criterion when defining a follower. In Indo-HCM, we included this parameter also because we observed that vehicles with smaller headways are also moving freely and they do not intend to overtake the leaders (we called them happy followers). Therefore, SD and gap both must be considered. The intersection point of histogram and the normal curve gives the minimum and maximum SD range for a highway when the vehicle can be called as following. During development of the Manual, we found that the vehicles that were travelling within a SD limit of -4 to +10 km/h and a gap value lower than 10 sec are the followers. I hope it answers your query. 2. NF is not Non-Followers, it is the Number of Followers, and it will depend upon the traffic volume on the road. The equation proposed in the manual is based on CG values, although it is not a parameter in NF equation.
Ashwini Ji, Sorry, I missed last part of your question in my answer. It is difficult to read ATS correctly from the graphs at a small screen like a laptop and therefore always recommended to calculate it. Graphs are plotted using these equations only. The value shown in the example problem is correct, I rechecked. Thanks for watching.
Thanks Dear Anirudh for your comment. I will certainly discuss all these topics in coming weeks. The only purpose of launching this channel is to clear the concepts and fundamentals of the subject matter. Keep watching and send the link to your friends also.
Sir can you please make a video on calculation of capacity of two lane two way road with 11-12 m carriageway width along with on-street parking Also How to use curve enveloping technique for capacity determination
Yes, I am making a video on method of capacity estimation from field data. It does not matter whether it is two lane or wider road. Method remains the same. will upload soon. Envelope curve technique is not a good technique for capacity estimation as it always overestimate the capacity.
LOS should be determined during both periods off-peak and on-peak. Peak period LOS is an indicator of traffic loading on the highway and should be considered for upgradation work.
Dear Sir, really good lecture and very easy to understand. I have one question. 1) how to understand v/c >1? Could you please explain when 'v' will be greater than 'c' since the capacity represents the maximum flow?
Thanks Anshuman, V/C ratio cannot be more than 1. If it is being shown more than 1 then it will only mean that the capacity is not estimated properly. Capacity value taken from the standard guide(s) may create this type of situation.
@@SatishIITR Thank you so much Sir for the quick response. I asked it because many a times we see V/C >1 corresponding to LOS F. So I was a bit confused.
LOS on Urban mid block sections are defined in diffreent manners in the different documents. INDO_HCM defines in terms of v/c ratio and Percent of free flow speed (PFFS). Some documents define in terms of delay particularly when signal density is high.
Respected sir, It is mentioned that the measures of effectiveness are same in HCM 2010 and HCM 2016. Then what makes the difference among the two manuals sir?
two manuals are different in many aspects but not for two-lane roads. The analyses of other facilities like intersections, roundabouts and multilane highways are different
थोड़ा मुश्किल है, पर कोशिश जरूर करूंगा। आपको कुछ विडियो के बाद देखने को मिलेंगा। Keep watching each video, You will certainly get something new every time.
@@rammilankumar1681 English was chosen as it is followed in class room teaching in all Engineering Colleges. Hindi may not be understood by many in South India. I am speaking very slow and in simple language, should not be difficult to understand
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Thankyou Sir for providing these Lectures in You tube Platform.
Thanks Dear. Please circulate in your other groups also for further dissemination of the knowledge.
Excellent lecture, very much useful for traffic engineering and transportation professional s.
Many thanks, please share in your groups.
Great work sir thank you so much.
Thanks. Please share with others also.
Thank you Sir for uploading this lecture, it is very useful.
Thanks Ms. Priti, Keep watching. you will get a new video on every Monday at 6.00 PM
Sir, great service , Indeed we are grateful to you. Regards
Thanks for your appreciation, Please send the link in all your groups for further dissemination.
@@SatishIITR Surely I'll do.
Thank you sir......
Most welcome. Keep watching and encourage your friends also to watch
Thank you so much
You're most welcome. Keep watching
Good afternoon sir;
I am watching your lectures regularly. Simultaneously I am taking the help of textbook for improving the knowledge in subject area.
I promise you sir that, with this video lectures I will explore the knowledge and try to transform the same to my maximum students.
Also, inform to the students about the link.
Thanks for shearing the video lectures.
The lectures are very interesting with practical knowledge.
Dr. Prashant P Nagrale
Professor & Dean finance
Department of Civil Engineering
Sardar Patel College of Engineering
Andheri west, Mumbai - 58.
🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻
Thanks Prashant, I am happy that you liked my videos. Please encourage your students and other colleagues to subscribe the channel to get each upload
Very good and interesting lecture sir
Plss try to cover design of controlled and uncontrolled intersections as well
Thanks Abhijit, I will certainly upload videos on intersections in coming weeks. Please keep watching.
Thank you for uploading the lecture on Level of Service.
May I request you to elaborate or clarify the following:
1. Distribution curve of speed difference (SD). How intersection of normal curve and histogram gives the maximum observed SD for highway.
2. Plot between Gap value and Cumulative distribution of Non-Followers. Possibly, an equation between NF and CG would also be useful.
May also like to see that in the solution of example as per HCM(2016), ATS by graph appears to be 55 mph, giving PFFS=91.6% or LOS of B.
Kind regards
Thanks Mr. Gupta for watching the video. My response to your comments is given below.
1. US HCM defines a follower if the gap between two vehicles is 3 sec or less, and a vehicle moving in free flow condition is this gap is more that 10 sec. It does not consider speed difference as the criterion when defining a follower. In Indo-HCM, we included this parameter also because we observed that vehicles with smaller headways are also moving freely and they do not intend to overtake the leaders (we called them happy followers). Therefore, SD and gap both must be considered. The intersection point of histogram and the normal curve gives the minimum and maximum SD range for a highway when the vehicle can be called as following. During development of the Manual, we found that the vehicles that were travelling within a SD limit of -4 to +10 km/h and a gap value lower than 10 sec are the followers. I hope it answers your query.
2. NF is not Non-Followers, it is the Number of Followers, and it will depend upon the traffic volume on the road. The equation proposed in the manual is based on CG values, although it is not a parameter in NF equation.
@@SatishIITR Thank you Sir for your prompt response and the clarifications.
Ashwini Ji, Sorry, I missed last part of your question in my answer. It is difficult to read ATS correctly from the graphs at a small screen like a laptop and therefore always recommended to calculate it. Graphs are plotted using these equations only. The value shown in the example problem is correct, I rechecked. Thanks for watching.
Sir, thanks a ton for this effort and helping us perfecting these critical concepts. If possible, Kindly discuss queuing theory and network analysis.
Thanks Dear Anirudh for your comment. I will certainly discuss all these topics in coming weeks. The only purpose of launching this channel is to clear the concepts and fundamentals of the subject matter. Keep watching and send the link to your friends also.
@@SatishIITR Sure Sir.
Respected Sir , please take a class on design of 3 phase Signalized intersection by webster method .
Video on Design of signals is already uploaded. Please watch it, you will learn design of signals
Sir can you please make a video on calculation of capacity of two lane two way road with 11-12 m carriageway width along with on-street parking
Also How to use curve enveloping technique for capacity determination
Yes, I am making a video on method of capacity estimation from field data. It does not matter whether it is two lane or wider road. Method remains the same. will upload soon.
Envelope curve technique is not a good technique for capacity estimation as it always overestimate the capacity.
Great information prof... my question is..is there a specific period of time to observe traffic before determine LOS.?..
LOS should be determined during both periods off-peak and on-peak. Peak period LOS is an indicator of traffic loading on the highway and should be considered for upgradation work.
Dear Sir, really good lecture and very easy to understand. I have one question.
1) how to understand v/c >1? Could you please explain when 'v' will be greater than 'c' since the capacity represents the maximum flow?
Thanks Anshuman, V/C ratio cannot be more than 1. If it is being shown more than 1 then it will only mean that the capacity is not estimated properly. Capacity value taken from the standard guide(s) may create this type of situation.
@@SatishIITR Thank you so much Sir for the quick response. I asked it because many a times we see V/C >1 corresponding to LOS F. So I was a bit confused.
Sir, how we will find "Level service" at mid blocks for Indian urban roads ?
LOS on Urban mid block sections are defined in diffreent manners in the different documents. INDO_HCM defines in terms of v/c ratio and Percent of free flow speed (PFFS). Some documents define in terms of delay particularly when signal density is high.
Respected sir,
It is mentioned that the measures of effectiveness are same in HCM 2010 and HCM 2016. Then what makes the difference among the two manuals sir?
two manuals are different in many aspects but not for two-lane roads. The analyses of other facilities like intersections, roundabouts and multilane highways are different
@@SatishIITR Thank you so much for the response sir.
Sir bech bech me hindi m v boliye.or v acha hoga🙏
थोड़ा मुश्किल है, पर कोशिश जरूर करूंगा। आपको कुछ विडियो के बाद देखने को मिलेंगा। Keep watching each video, You will certainly get something new every time.
@@SatishIITR Sir Hindi language use kigiye kisi ko v samjhe me easy rahega..
@@rammilankumar1681 English was chosen as it is followed in class room teaching in all Engineering Colleges. Hindi may not be understood by many in South India. I am speaking very slow and in simple language, should not be difficult to understand