Anti-dazzle (or anti-glare) screens are designed to minimise light from opposing headlight. A study from the UK found that these screens can reduce injury crashes by up to 11%. 

When installing, make sure the design of the attachments doesn’t impact the barrier’s effectiveness.  

Reference: Walker, A. E. & R. G. Chapman. (1980). Assessment of anti-dazzle screen on M6. TRRL Laboratory Report 955. Transport and Road Research Laboratory, Crowthorne, Berkshire