See: Wide outside lane.
There are two major issues transportation engineers need to take into account for bicycling: intersection clearance times and bicycle detection at demand-actuated traffic signals. Where bicycles are common, green wave timing may also be relevant.
Bicycle tires being narrow, road surface is more important than for other transport, for both comfort and safety. The type and placement of storm drains, manholes, surface markings (paint), and the general road surface quality should all be taken into account by a bicycle transportation engineer. Drain grates, for example, must not catch wheels.
Sidepaths are used extensively throughout The Netherlands, especially when exiting towns and cities, and in Danish cities, and this fact is often used to show that sidepaths can be used effectively. However the sidepaths in Amsterdam are a very special case for several reasons. There are more bicycles than cars in Amsterdam; almost all of these bicycles are of a similar type and operate at a similar speed; and pedestrians do not share these sidepaths.
Bicycle parking is another important part of Bicycle Transportation Engineering. In most of the United States, bicycle parking facilities are missing or are so inadequate that nearby trees or parking meters are used. The hitching post type of bicycle rack is an improvement over the old type that had a slot for the front wheel but only allow for two bicycles per post. The Netherlands, where bicycles are much in use, has two-tiered bicycle racks giving high density (the handlebars overlap) and security (the bicycle is held well and is easy to lock).