Having blocks of road rectangles can help services and people move around extremely quickly. This is helpful with drawing precise curves such as building custom roundabouts.
You can build bridges and tunnels by adjusting the road's elevation with Page Up and Page Down keys.You can bulldoze the two lane road piece and get a partial refund. Building a short segment of two lane road anywhere within city limits unlocks more roads, such as a one way road which is useful with the highway stubs you're provided at the start.2 Basic services and early budget management.
