Bumps races are typically raced in a series over several days. The starting order of each day's race is based on the previous day's results; the first day's starting order each year is determined by the results on the last day of the previous year. Each day the boats line up bow-to-stern, usually along the bank of the river, with a set distance between each boat and the next (usually about one and a half boat-lengths of clear water). The starting positions are usually marked by a rope or chain attached to the bank, the other end of which is held by each boat's cox. Boats wait along the bank, and may be poled out just in time for the start, to avoid drifting. At the start signal the cox lets go of the rope and the crew starts to row, attempting to catch and "bump" the boat in front while simultaneously being chased by the one behind.