A study of the various methods of detecting stationary vehicles on a road comes to the conclusion that cameras and processing of the video from those cameras was the only commercially viable method.
Vehicle detection in intelligent transport system under a hazy environment: a survey
The last line of the abstract is
""This study finally highlights the problems encountered during surveillance under extreme weather conditions""
Vehicle detection in intelligent transport system under a hazy environment: a survey
The last line of the abstract is
""This study finally highlights the problems encountered during surveillance under extreme weather conditions""