3/4 inch temporary roadway sheet Home » News » Ground Protection Mats 4x8 » 3/4 inch temporary roadway sheet. Guidance for the Use of Temporary Rumble Strips in Work Zones . At 45 mph, 4.59 foot (1.4 meters) spacing is driven over too quickly to feel the full effect, although having spacing within a pattern that ranged between 7.87 – 8.86