Herts Student posted a topic in Student Officers’ Essays, Theses and DissertationsGood afternoon. I am in my final year studying Automotive Engineering at the University of Hertfordshire, I am producing a report looking into the aerdynamic effects of various Police light bars. In the introduction I am planning to state how even the most minute of reductions in drag from them will reduce emissions given the milage an average light bar equipped vehicle covers multiplyed by the number of police vehicles there are with light bars attached. I have tried searching the net but cannot find either of these valuesould greatly appreciate any help on those numbers as well as your name in order to reference. Thanks for your help.