Monitor the junk that fills in empty space

The main benefit in the space is (as you said), it is exactly the right room for density growth.

The other benefit of the last example, is that you control which street those buildings will face. All of the traffic they generate will be there. Emergency vehicles will stop only on that road, avoiding jams on the other roads.

There are 10 commodities in Simcity, and I will address them each in kind:

With the exception of Coal and Ore, all commodities listed are also required in the creation of certain great works.

RAW COMMODITIES

All Raw Commodities are non-renewable resources.

• Oil - You must drill for Oil where there are appropriate oil deposits. You must place an oil well directly above a source of oil to be able to pump any out. Oil can be sold or used in crude form, or refined into fuel and plastics which typically fetch a higher price. Crude oil can also be used in Oil power plants, providing a cheaper source of energy than buying from the world market.

• Ore - You must mine Ore where there are appropriate ore deposits. You must place an Ore mine directly above a source of Ore to be able to extract it. Ore can be sold as a raw material, or refined into Alloy and Metal which typically fetch a higher price.

• Coal - You must mine Coal where there are appropriate coal deposits. You must place a Coal mine directly above a source of Coal to be able to extract it. Coal can be sold as a raw material, or refined with Metal to create Alloy. Coal can also fuel Coal power plants, which can provide the city and region with a cheaper source of energy than buying Coal from the world market.

PROCESSED RAW COMMODITIES

With the exception of Fuel, all processed Commodities are a renewable resource, as they can be produced through a Recycling Center.

• Fuel - Created through the refining process of crude oil. Requires an Oil refinery with a Fuel Distillation Unit. Outside of great works, Fuel is only used to sell for profit.

• Plastic - Created through the refining process of crude oil. Requires an Oil refinery with a Plastic Polymizer. Can be sold on the world market, or further used to assemble more advanced items.

• Metal - Created through the refining process of ore. Requires a Smelting Factory with a Metal Furnace. Can be sold on the world market, or further used to assemble more advanced items.

• Alloy - Created through the refining process of ore. Requires a Smelting Factory with an Alloy Furnace and a source of coal. Can be sold on the world market, or further used to assemble more advanced items.

FINISHED COMMODITIES

All Finished Commodities are a renewable resources, as their components can be produced through a Recycling Center.

• Processors - Processors are created inside a Processor Factory using the already refined materials plastic and alloy. These can either be produced locally via the manufacturing process, acquired as a byproduct of recycling centers, bought on the world market, or any combination of these. Processors can be sold for profit, traded, or further used to create consumer electronics such as TVs and Computers.

• TV - TVs are created from manufactured processors inside a Consumer Electronics Factory containing a TV assembly line. Additionally, Plastic and Alloy are both required materials, however the player probably is already acquiring these in some way to create processors. TVs can either be sold for large profits, or put to use on great works.

• Computer - Computers are created from manufactured processors inside a Consumer Electronics Factory containing a computer assembly line. Additionally, Plastic and Alloy are both required materials, however the player probably is already acquiring these in some way to create processors. Computers can either be sold for large profits, or put to use on great works.