Battenburg markings are a pattern of high-visibility markings developed in the United Kingdom and used in several European countries. The Battenburg design typically has two rows of alternating rectangles along the sides of a vehicle. The Battenburg design uses the contrast between a light and a dark color to increase conspicuity for the human eye. The lighter color is daylight-fluorescent (such as fluorescent-yellow) and provides for better visibility in daytime. The complete pattern is retro-reflective using 3M Diamond Grade or Scotchlite material to provide night-time visibility. Battenburg Marking are considered more effective than Sillitoe checkered square markings as the Sillitoe checkers can make the vehicle harder to visualize. Hybrid designs are usually a mixture located somewhere between Battenburg, Sillitoe and fluorescent formats. Sillitoe and hybrid marking schemes do not have the high visibility/conspicuity of Battenburg markings.