Kazuma's start was close to perfectly timed with Hotaru's acceleration. Both cars launched off the grass, taking a small amount of time uprooting it until the ground was firm enough to give the tires grip. Both cars sped towards the river, allowing only an arm's gap between the racing vehicles.
As they reached the edge of the cliff, Kazuma nudged the opposing car slightly to alter its landing, causing it to land slightly sideways and to slip on the opposing bank. The simple maneuver caused Kazuma's car to be ahead by only around 10 feet.
As for Kuriko's car, they did not start right on time from being delayed and were about 3 seconds behind the farthest car.
Soon, the path became a rocky forest area, with a few different means of passing. First, dodging the trees would be difficult and would loose speed, but has the shortest distance, about 50 meters off. At least two more open areas were available but were longer methods and went off course about 400 meters each. They would be the safest and obviously most discouraged route. Laced with rocks, there was the option of following the river which did go off about 100 meters, but that was if you were willing to drive in the water, risking sinking or slipping. Right down the center path was a cliff, with at least a 30 foot drop, if not more. Common sense would generally disagree with this path, but what does it know?