A state transportation agency has established crash reduction factors shown in the table. An intersection has been identified as having an abnormally high left-turn crash rate (14, 19, and 23 crashes...

A state transportation agency has established crash reduction factors shown in the table. An intersection has been identified as having an abnormally high left-turn crash rate (14, 19, and 23 crashes in the last three years), attributed to excessive speeds and the absence of an exclusive left-turn phase. The AADT at the intersection for the last three years is 5, 630 vehicles per day, and the AADT for after implementation is 6, 240 vehicles per day. Determine the appropriate countermeasures, and the expected reduction in crashes if the countermeasures are implemented