The correct options are
A Pollution
B Traffic
D Safety concerns
Travelling by road comes with some demerits. Most vehicles these days still run on I.C engines which use carbon-based fuels like petrol or diesel to run. These engines release pollutants like carbon monoxide, nitrogen oxides and other chemicals which pollute the environment and add to the carbon footprint of the planet. As it is the most common mode of transport in urban areas, the number of vehicles on the roads is constantly increasing, thereby causing congestion and traffic. Human error is the most common reason for accidents. Hence, safety is a concern while travelling by road as there are a large number of people using the road at any time. Road transport can be a cheap mode of transport. Hence, it is affordable.