MUTCD PART 2 - Chapter 2C
Warning Signs and Object Markers view pdf | view table 2C.2 
  Quick Reference: Sign Sizes for Roadway Type view chart
Ramp Metered When Flashing Warning Signs
A Ramp Metered Ahead sign may be used to warn road users that a freeway entrance ramp is metered and that they will encounter a ramp control signal.
	
		- 
			PRODUCT ID: S(XXXX)W38(X)A
 
		- Size (XXXX):
 
(3636) 36" x 36" highway ramp sign for use on Single Lane/Multi-Lane Roads
 
		- 
			Reflective Sheeting (X):
			(H) High Intensity Prismatic
			(3) DG3 Diamond Grade
			(3)A(Y) Fluorescent DG3 Diamond Grade 
		- 
			Substrate: .080" Aluminum
 
		- 
			MUTCD Sign Designation: W3-8