Intelligent Transportation system is a potential system which uses Vehicular Ad hoc Networks (VANET) with internet for its safety driven applications. VANET is infrastructure less and the vehicles form a self-structured network. During data forwarding, the vehicles undergo congestion which is a vital issue related to VANET. To overcome this the data has to be propagated in a particular path in optimized fashion . Routing protocols play a vital role for the propagation of data among nodes. This paper reveals the general idea of position routing protocols with much emphasize on Non delay routing protocols. Various parameters such as packet delivery ratio , end to end delay , throughput and cost were analyzed using hybrid NDTN routing protocols. It also focuses on various aspects of VANET like architecture, an overview of routing protocols, position based routing protocols, classification and related works contributed by various researchers.

Beacon,Overlay,End to End delay, Packet Delivery ratio

[1] Wenshuang Liang1, Zhuorong Li1, Hongyang Zhang1,Yunchuan Sun2, and Rongfang Bie1,”Vehicular Ad Hoc Networks: Architectures,Research Issues, hallenges and Trends “ Springer International Publishing Switzerland 2014.
[2] Hannes Hartenstein,University of Karisruhe,Kenneth .P.Laberteaux,Toyota Technical center, ” A Tutorial Survey on Vehicular Adhoc Networks” ,IEEE Communication Magazine June 2008
[3] Neha goel ,Isha Dyani,Gaurav sharma,.”A Study of Position based VANET routing protocol”, IEEE 2016
[4] Balasubramani, Karthikeyan.L Deepalakshmi.V. “Comparison study on Non Delay Tolerant Routing protocols in vehicular networks “ , Science Direct-Proceedia -2015
[5] R.Brendha, Dr.V.Sinthu Janita Prakash,”A Survey on Routing protocols for Vehicular Ad Hoc Networks”,2017,International conference on Advanced computing and communication(ICACCS 2017)
[6] Zineb Squali Hussaini,Imane Ziami- ‘Improvement of GPSR protocol by using Future position estimation of participating nodes in VANET’, IEEE 2016, pg 87-94.
[7] Rewadkar, Dharmpal Doye, (2017) “FGWSO-TAR:Fractional Glowworm swarm optimization for traffic aware routing in urban VANET”, International Journal of Communication Systems Volume 31, Issue 1,Wiley Online Library.
[8] Moez Jerbi* Rabah Merdah, “GyTAR: Improved Greedy Traffic Aware Routing Protocol for Vehicular Ad Hoc Networks in City Environments” ,Proceeding of the 3rd international workshop on Vehicular Adhoc networks ISBN: 1-59593-540-1.

[9] Konstantinos Katsaros, Mehrdad Dianati, “CLWPR - A Novel Cross-Layer Optimized Position Based Routing Protocol for VANETs”, Vehicular Networking Conference (VNC), 2011 IEEE.
[10] Anant Ram ,Manas Kumar Mishra ,”Density Aware Position Based Routing (DAPBR) protocol for VANET “, 2016 pages 142-146,IEEE Conference.
[11] Gen Li,Maode Ma ,(2015), “Adaptive fuzzy multiple attribute decision routing in VANET”- Wiley Online Library https:/doi.org/10.1002/dac.3014.
[12] Abdel muttlib Ibrahim Abdalla Ahmed,Abdullah gani,(2017), “Intersection Based Distance and Traffic Aware Routing (IDTAR) protocol for Smart Vehicular Communication”, IEEE 2017. 13th International Wireless Communications and Mobile Computing Conference (IWCMC) Year: 2017 Pages: 489 – 493.
[13] Harinder Kaur, Meenakshi ,” Analysis of VANET Geographic Routing Protocols on Real City Map”, 2017 2nd IEEE International Conference On Recent Trends in Electronics Information & Communication Technology (RTEICT), May 19-20, 2017, India
[14] Neha Goel,Isha Dhyani,Gaurav sharma-“An Acute Position Based VANET routing protocol”- IEEE 2016, International Conference on Micro-Electronics and Telecommunication Engineering (ICMETE) Year: 2016, Pages: 139 – 144 .
[15] Nizar Alsharif Xuemin Shen “iCAR-II: Infrastructure-Based Connectivity Aware Routing in Vehicular Networks”, Page(s): 4231 – 4244,IEEE 2016
[16] Ahmed Nazar Hassan, Omprakash Kaiwartya , ”Inter Vehicle Distance Based Connectivity Aware Routing in Vehicular Adhoc Networks“ -Springer Science+Business Media,LLC 2017.
[17] Michele Rondinone , Javier Gozalvez ,” Contention-based forwarding with multi-hop connectivity awareness in vehicular ad-hoc networks”,Elsevier Computer Networks ,Volume 57, Issue 8, 4 June 2013, Pages 1821-1837
[18] Kamlesh Kumar Rana, Sachin tripathi, Ram Shringer Raw, “Analytical Analysis of Improved Directional Location Added Routing Protocol for VANETs”, Springer Science+Business Media,LLC2017 DOI 10-1007 /11277-017-4980-y.
[19] Raj K Jaiswal, “Predicted Position Based Routing Protocol Using Kalman Filter for Vehicular Ad-hoc Network”, ICDCN `17 Proceedings of the 18th International Conference on Distributed Computing and Networking.