Identify the relevant similarities and dissimilarities between the present case and past cases, and determine which are most important under the circumstances. Then answer the legal question on the basis of these judgments, and explain your answer by reference to the relevant similarities and dissimilarities.

A city ordinance provides that "No person shall bring a vehicle into a city park". In past cases, ordinary cars, trucks, motorcycles, go-carts, lawn tractors, and large model airplanes ARE "vehicles" for purposes of the ordinance; however bicycles, roller skates, electric wheelchairs, pogo sticks, horse-drawn carriages, municipal garbage trucks, and police cars. and other emergency vehicles are NOT.

Darren, riding a snow sled, recklessly careens down a park slope, injuring serval children. Is he guilty of violating the ordinance?