Almost always UDP

As in most of the application of VANET immediate data transmission is important without waiting for acknowledgement, so UDP is generally preferred.

Dear Kishor Tayade,

the performance analyzes of TCP and UDP in VANET in the following literature sources partly provide an answer to your question:

Jun-Li Kuo, Chen-Hua Shih, Yaw-Chung Chen: Performance analysis of real-time streaming under TCP and UDP in VANET via OMNET; 13th International Conference on ITS Telecommunications (ITST), 2013

https://www.researchgate.net/publication/261452405

Adel Eissa: SURVEY STUDY FOR VEHICULAR AD HOC NETWORKS PERFORMANCE IN CITY AND URBAN RESIDENTIAL AREAS: Master Thesis, University of Vaasa, Feb 2017 ; s. Sections 6.1.2 and 6,1.3

https://core.ac.uk/download/pdf/197962009.pdf

Maicke C. G. Paula, Joel J. P. C. Rodrigues, João A. Dias: Performance Evaluation of a Real Vehicular Delay-Tolerant Network Testbed; International Journal of Distributed Sensor Networks; Mar 2015

https://doi.org/10.1155/2015/219641

Best regards

Anatol Badach

Dear Sir,

Thank you everyone for your valuable reply.

Hi Kishor Tayade ,

I think the following papers of my work can help you:

Conference Paper Geographic and topology based routing protocols in vehicular...

Article Performance Analysis of Routing Protocols with Roadside Unit...

The above papers study and analyze an overall performance evaluation of several routing protocols, including a position based and topology routing protocol. Besides taking into consideration TCP/UDP in VANET.

Best regards,

Safae Smiri

https://www.semanticscholar.org/paper/Performance-Evaluation-of-TCP-and-UDP-Protocols-in-Kusum-Prachi/4c10fcb9cc9b6ef298d0682a65ff2efc20a13fdc

UDP