Vehicular Ad-hoc Networks (VANETs) have been recently attracting an increasing attention from both research and industry communities. The emerging and promising VANET technology is distinguished from mobile ad hoc networks (MANET) and wireless sensor networks (WSN) by large-scale deployed autonomous nodes with abundant exterior assisted information, high mobility with an organized but constrained pattern, frequently changed network topology leading to frequent network fragmentation, and varying drivers behavior factors. In this paper, We introduce a promising realistic vehicular mobility model and evaluate the performance of following routing protocols: AODV, DSR and TORA. A variety of highway scenarios, characterized by the mobility, load, and size of the network were simulated. Our results indicate the reactive routing protocols performance, which is suitable for VANET scenarios in terms of packet delivery ratio, routing load, and end-to-end delay

1. A. K. Saha and D. B. Johnson, 2004, “Modeling mobility for vehicular ad hoc networks,” In Proceedings of ACM International Workshop on Vehicular Ad Hoc Networks, pp. 91-92.
2. J. J. Blum, A. Eskandarian, and L. J. Hoffman, 2004, “Challenges of Inter vehicle Ad Hoc Networks”, IEEE Transactions on Intelligent Transportation Systems, Vol. 5. No. 4.
3. J. Blum, A. Eskandarian, and L. Hoffman, 2003, "Performance Characteristics of Inter- Vehicle Ad Hoc Networks". The IEEE 6th International Conference on Intelligent Transportation Systems, Shanghai, China, page 114-119.
4. Meng Jun Tong, Li Yu, Chang Heng Shu, Qi Fen Dong, Feng Gao, 2011, ‘‘Research and Simulation of Routing Protocol in Different VANET Scenarios”, Journal of Advanced Materials Research (Volumes 217 - 218), Switzerland.
5. Gongjun Yan, Nathalie Mitton, Xu Li, 2011, “Reliable Routing in Vehicular Ad hoc Networks”, The 7th International Workshop on Wireless Ad hoc and Sensor Networking (WWASN 2010), Genoa, Italy.
6. Bijan Paul, Md. Ibrahim, Md. Abu Naser Bikas, 2011 “VANET Routing Protocols: Pros and Cons”, International Journal of Computer Applications, Volume 20– No.3.
7. Qing Yang, 2011 "Adaptive Connectivity Aware Routing Protocol for Wireless Vehicular Networks”, A dissertation of Ph.D. at Auburn University.
8. B. Ramakrishnan, Dr. R. S. Rajesh, R. S. Shaji, 2010 “An Intelligent Routing Protocol for Vehicle safety communication in Highway Environments”, Journal of Computing, Volume 2, Issue 11.
9. Yun-Wei Lin, Yuh-Shyan Chen and Sing-Ling Lee, 2010 “Routing in Vehicular Ad Hoc Networks: A Survey and Future Perspectives,” Journal of Information Science and Engineering.
10. Sajjad Ali & Asad Ali, 2010 “thesis - Performance Analysis of AODV, DSR and OLSR in MANET”, Department of Electrical Engineering with emphasis on Telecommunication Blekinge Institute of Technology, Sweden, 2009.
11. R.S. Raw, S. Kumar, S. Das,, “An Efficient Position-Based Routing Protocol for Vehicular Ad Hoc Network in City Traffic Scenarios”, RISTEP-2010, NIT Srinagar, India, 2010.
12. The Network Simulator, ns-2 http://www.isi.edu/nsnam/ns.
13. QualNet network simulator, http://www.scalable-networks.com.
14. OPNET NetworkModeling and Simulation, http://www.opnet.com/services/university.
15. Broch, J., Maltz, D.A., Johnson, D.B., Hu, Y.-C. and Jetcheva, J., 1998. A performance comparison of multi-hop wireless ad hoc network routing protocols, Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networking. ACM, Dallas, Texas, United States, pp. 85-97.
16. Park, V.D. and Corson, M.S., 1997. A highly adaptive distributed routing algorithm for mobile wireless networks, Proceedings of the 16th Annual Joint Conference of the IEEE Computer and Communications Societies. IEEE Computer Society, pp. 1405-1413.
17. Peiyan, Y. and Layuan, L., 2006. Performance evaluation and simulations of routing protocols in ad hoc networks, Proceedings of the 2006 workshop on Broadband wireless access for ubiquitous networking. ACM, Alghero, Italy.
18. Perkins, C.E. and Bhagwat, P., 1994. Highly dynamic destination-sequenced distance-vector routing (DSDV) for mobile computers. ACM SIGCOMM Computer Communication Review, 24(4): 234-244.
19. Perkins, C.E. and Royer, E.M., 1999. Ad-hoc on-demand distance vector routing, Proceedings of the 2nd IEEE Workshop on Mobile Computer Systems and Applications. IEEE Computer Society, pp. 1405-1413.
20. Perkins, C.E., Royer, E.M., Das, S.R. and Marina, M.K., 2001. “Performance comparison of two on-demand routing protocols for ad hoc networks”, IEEE Personal Communications, page no. 16-28.
21. B. Ramakrishnan, Dr. R. S. Rajesh, R. S. Shaji, 2010 “ An Intelligent Routing Protocol for Vehicle safety communication in Highway Environments”, Journal of Computing , Volume 2, Issue 11.
22. Carolina Tripp Barba, Karen Ornelas, Monica Aguilar Igartua, 2010 “Performance Evaluation of a Hybrid Sensor and Vehicular Network to Improve Road Safety”, 7th ACM PEWASUN 2010, Bodrum, Turkey.
23. Fiore, M.; Harri, J.; Filali, F.; Bonnet, C. 2007 “Vehicular Mobility Simulation for VANETs Simulation” Symposium, 2007. ANSS apos;07. 40th Annual Volume , Issue , Page(s):301 – 309

MANET VANETs AODV DSR TORA