Vehicle that might frustrate highway drivers when it moves into the passing lane

SEMI

Think of a large truck often seen hauling freight that can block visibility when it lingers in the left lane. Its name comes from its trailer configuration.

This clue hints at a large truck, often called a "semi," which can annoy drivers by blocking the left lane meant for passing. The word "semi" is short for "semi-trailer truck," a common sight on highways that moves slowly when loaded. The frustration comes from its size and speed, making it a fitting answer for the scenario described.