on dark background, such as white on black, green, blue, brown, purple or red) on September 2, 2004, though not on negative-contrast road signs (dark legend on light background, such as black on white, yellow or orange), given its inferior legibility to the existing FHWA typefaces in these applications. The FHWA also refused to add Clearview to the 2009 MUTCD, citing lack of testing on Clearview's numerals, symbols, and narrower typefaces. In April 2014, FHWA indicated it expected to rescind Interim Approval to use Clearview in the future, eventually doing so in January 2016. Congress ordered the FHWA to reinstate the interim approval on March 28, 2018. Outside the US, Clearview has been adopted in Canada where it has been the standard typeface for signs in British Columbia since 2006 and used for street signs in Toronto. Clearview has been adopted as the standard typeface for road signs in Indonesia since 2014. Since 2016, Ontario's Ministry of Transportation has started using Clearview on some signs on the Queen Elizabeth Way. Variants In addition to its appearance on road signage, a customized version of the ClearviewText typeface was adopted by AT&T for corporate use, including advertising, used from 2006 to 2016. ClearviewText and ClearviewADA are versions of the typeface intended for use in general graphic design and ADA-compliant signage. An example of ClearviewADA in use is signage at Dallas/Fort Worth International Airport. Adoption United States Between 20 and 30 states have adopted the use of the typeface as of 2013. It was not the official font recommended for use by the FHWA and states were required to request interim approval from the Federal Highway Administration to use the font. On January 25, 2016, the Federal Highway Administration issued a notice in the Federal Register of the agency's intent to rescind interim approval for use of the Clearview font in 30 days. FHWA discussed the current state of road signage research and concluded that "the consistent finding among all the research evaluations is that the brightness of the retroreflective sheeting is the primary factor in nighttime legibility." Even worse, significant misunderstandings and misapplications of the interim approval for Clearview were resulting in badly designed non-uniform signs that violated the uniformity central to the Manual on Uniform Traffic Control Devices. Accordingly, the notice concluded, "FHWA does not intend to pursue further consideration, development, or support of an alternative letter style." The rescission of