Final answer:
Mopeds cannot freely ride between trolley rails on streets because it is unsafe and could lead to accidents. All vehicles must follow traffic laws for safe operation in urban environments.
Step-by-step explanation:
The question addresses the operating conditions of vehicles in urban environments, specifically related to how mopeds may navigate around trolley rails. The answer to whether mopeds can freely ride between trolley rails on streets is No. Riding between trolley tracks can be dangerous due to the risk of the moped's tires getting caught in the rails, leading to potential accidents. It is essential for all vehicles, regardless of size, to operate safely and within the constraints of local traffic laws.
In historical context, as cities expanded and transportation within cities became more congested, new forms of transportation like trolleys were introduced to improve efficiency. This evolution from horse-drawn carriages to trolleys and eventually to subways is a crucial element of urban development.