Final answer:
Transit lanes on roadways are commonly designated for buses to facilitate smoother travel in public transportation by reducing traffic delays. These lanes may also be used by high-occupancy vehicles (HOVs) but are not reserved for bicycles, trucks, or any single non-transit vehicle category.
Step-by-step explanation:
In the context of roadway designations, "Transit" lanes are often reserved for specific types of vehicles in order to improve the flow of traffic and provide efficient public transportation options.
Such lanes are typically designated for buses and may also accommodate high-occupancy vehicles (HOVs), which are vehicles with multiple passengers.
The goal of these lanes is to encourage carpooling and the use of public transportation. In some cities, these lanes are also used by other forms of transportation such as trolley buses, which are electric buses drawing power from overhead wires, thereby contributing to a greener city infrastructure.
When considering the options provided: 1) bicycles only, 2) high-occupancy vehicles (HOVs) only, 3) trucks only, 4) buses only; the correct answer would typically be the one most associated with public transit, which is buses only.
Transit lanes ensure that buses can travel more freely without getting stuck in traffic, hence improving the reliability and speed of public transportation services.