BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:2337,
author = {Donghao Qiao and Jiayuan Zhou and Farhana Zulkernine},
title = {Traffic Information Detection},
howpublished = {EasyChair Preprint 2337},
year = {EasyChair, 2020}}