Centre-line removal

"Shackel, S. and Parkin, J. (2014) Measuring the influence of on-road features and driver behaviour on proximity and speed of vehicles overtaking cyclists. Accident analysis and prevention 73, December, pp100-108"

http://authors.elsevier.com/a/1Ph-nLDQchXW

as referenced here:
http://www.ctc.org.uk/press-release/2014-09-18/remove-centre-line-increase-safety