Gases that contribute to the greenhouse effect include: 1  Water vapor. 2  Carbon dioxide (CO 2). 3  Methane. 4  Nitrous oxide. 5  Chlorofluorocarbons (CFCs).ases that contribute to the greenhouse effect include: 1  Water vapor. 2  Carbon dioxide (CO 2). 3  Methane. 4  Nitrous oxide. 5  Chlorofluorocarbons (CFCs).
Parallel parking. Parallel parking is a method of parking a vehicle parallel to the road (hence the term 'Parallel Parking'), in line with other parked vehicles. Parallel parking usually requires initially driving slightly past the parking space, parallel to the parked vehicle in front of that space, keeping a safe distance, then followed by reversing into that space.
Double parking can refer to parking parallel to a car already parked at the curb, double parking in attended car parks and garages, or multi-space parking.ouble parking means standing or parking a vehicle on the roadway side of a vehicle already stopped, standing or parked at the curb.