Ford Crown Victoria Police Interceptor, modelled for a L4D2 mod project. This whole project took me about 3 weeks to complete, 2 weeks of combined modelling, uv unwrapping and texturing, and about a week to convert to low poly mesh and port it to the Source Engine.
This car was modelled loosely based off the 2001 Ford Crown Victoria P71, which featured a honeycomb grille, black rear trim and no rear amber indicators. The lightbars are based off the Federal Signal Streethawk and Federal Signal Vector. Of course, proportions may not be 100% as I only have reference images to model from.
L4D2 mod addon is available here: https://steamcommunity.com/sharedfiles/filedetails/?id=2776474002