In all rural areas in Oregon, the speed limit is 55 unless otherwise posted. Until 2002, Oregon state law required that all speed limit signs omit the word LIMIT from their display. The reasoning behind this was related to the explicit "basic speed" law that existed, which allowed citation for exceeding speeds "too fast for conditions" regardless of the posted speed. The typeface of the numerals on the signs varies greatly depending on which jurisdiction made the sign, due to its non-standardized design. In 2002, the Oregon Department of Transportation revised its supplement to the MUTCD, mandating the omission of the word LIMIT "except" on signs posted on Interstate highways and within city limits. As of 2014, ODOT has replaced nearly all SPEED signs posted on Interstates with SPEED LIMIT signs, but it was left to the various city governments to replace signs in their jurisdictions at their leisure, if at all. Thus, older SPEED signs are still a common sight across the state. In 2003, the Oregon state legislature passed a bill that would have raised the maximum permissible speed limit on Interstate Highways to 70 mph for cars with a 5 mph differential for trucks, up from the previous 65 mph limit for cars with a 10 mph differential; this bill was signed into law by then newly elected Governor Ted Kulongoski on September 26, 2003. Although ODOT's 2004 study revealed that it is safe for cars to be traveling at 70 mph and trucks at 60 mph the Oregon Department of Transportation decided to not initially implement the increase out of concerns that it would not be safe to have trucks traveling at 65 mph. Prior to the National Maximum Speed Law, the speed limit on Oregon freeways was 75 mph with some 70 limits on two-lane roads in eastern portions of the state. On July 20, 2015, Governor Brown signed HB 3402 into law. This bill raises the speed limit on I-84 east of The Dalles, I-82 (HB 4047 signed 2/23/16) and US 95 to 70 mph for cars and 65 mph for trucks. It also increases speed limits on several other two lane rural highways to 65 mph for cars and 60 mph for trucks in Eastern Oregon. The law took effect on March 1, 2016. In 2004, a law was passed revising Oregon's school speed limit laws. In school zones, on roads with speed limits of 30 mph or below, drivers were required to slow to 20 mph 24 hours a day, 365 days a year, regardless of whether or not children were present.