Durability test of retro-reflecting materials for road signs at Nordic test sites - Ageing model for retro-reflectivity after 6 years of exposure
(in English),
Kai Sørensen and Sven Olof Lundkvist, May 2004 - PDF (308 kb)
 

The durability project - application and first measurements in Denmark
(in English),
Kai Sørensen, DELTA, September 2004 - PDF (116 kb)
 

Vurdering af retroreflekterende vejtavlers luminans og læsbarhed for førere af store køretøjer
(in Danish - translates to "Evaluation of the luminance and legibility of retroreflective road signs for drivers of large vehicles")
Kai Sørensen, DELTA, June 2004 - PDF (38 kb)
 

Er der stadig noget galt med rundkørslerne om natten?
(in Danish - translates to "Is something still the matter with
roundabouts at night ?)
Kenneth Kjemtrup, Vejdirektoratet, Ib Lauridsen, Frederiksborg Amt og Kai Sørensen, DELTA - PDF (198 kb)
 

Measuring methods for the daylight properties of microprismatic sheeting materials,  (in English),
Kai Sørensen, DELTA, November 2003 - PDF (112 kb)
 

Test methods for the coefficient of retroreflection of microprismatic sheeting materials, (in English)
Kai Sørensen, DELTA, April 2004 - PDF (127 kb)
 

Performance based requirements for retroreflective road signs,
(in English)
Kai Sørensen, DELTA, Revised April 2004 - PDF (159 kb)