; Public Law 117–58 ) is amended— (1) in paragraph (3), by adding and at the end; (2) in paragraph (4), by striking ; and and inserting a period; and (3) by striking paragraph (5). (c) GAO Study (1) In general The Comptroller General of the United States shall conduct a study on the use of the Manual on Uniform Traffic Control Devices (referred to in this subsection as the Manual ) by State and local government traffic engineers, planners, and consultants— (A) to provide an estimate of the extent to which practitioners, based on a representative sample— (i) exercise engineering discretion as permitted by the Manual for street designs intended to increase safety and improve multimodal access; and (ii) feel constrained or otherwise discouraged from implementing alternative street designs that improve safety outcomes by the guidelines in the Manual; (B) to estimate the average increases in costs and time needed to complete a project caused by the need to request or otherwise determine an exception to the Manual, including requirements for engineering studies; and (C) to identify the types of facilities, projects, and contexts for which discretion to deviate from the Manual are most frequently sought. (2) Report Not later than 2 years after the date of enactment of this Act, the Comptroller General of the United States shall— (A) submit to Congress a report that describes the findings and conclusions of the study conducted under paragraph (1); and (B) make the report under subparagraph (A) publicly available online. 4. Federal design standards and guidelines (a) Statutory design guidelines Section 217(g)(1) of title 23, United States Code, is amended— (1) in the first sentence, by striking given due consideration and inserting accounted for, where not incompatible,