Compare how bicycles fit at a public rack

Mark where a bicycle's frame can reach the rack and how the wheels align. Include obstructions such as curbs, posts and adjacent seating.

Observe an empty rack and then a comparable period when several bicycles are locked there. Keep the short-term conditions with the permanent features. Weather, an event and doors opening during a busy period can affect what you notice. A separate time note lets you compare layout and use even when the two visits feel very different on arrival.

An empty space beside two broad handlebars might remain inaccessible from its usual approach. Observe from the position a visitor can realistically reach, including any place where two routes meet. If a busy area makes close observation inconvenient, stand farther away and note the limits of what you can judge. A clear field record includes both the useful comparison and the parts of the space you could not inspect.

Record how handlebars and wheels overlap while staying clear of riders. Note which positions still allow another bicycle to approach easily.

Bicycles parked at opposite angles can hide the effect of the rack geometry. Give each observation a reference point easy to find from a public route. A visible doorway, a junction or a fixed seat can be more useful than a vague estimate. Write down where you stood and which way you faced so another visit gives you a comparable view.

Draw both wheel positions and the space needed to approach each gap. Check how each observation looks on a simple plan. Put durable features on the base drawing and make separate marks for temporary conditions such as parked bicycles, groups or puddles. This gives later notes somewhere to go if a new visit shows an earlier condition was short-lived.

Compare the geometry with a rack facing an unobstructed approach. Keep notes about people using the space at the level needed to understand the route. A sketch can show where people pause, walk or wait without identifying anyone. Separate the approximate path from a particular event that temporarily reinforced or blocked it and record the time window you observed.

Bring only the information you can record without disrupting the route. A rough sketch and an image taken from a clear public position can preserve different details. Add the time, direction and landmark as soon as you finish the observation so anyone using the record can connect a feature to its place. Use the next visit to answer a specific question from the first one. Record how the observation itself changed alongside what was different about the site. Two visits taken at different hours can reveal something helpful about use, even when they are too different to support a direct comparison of the layout or surface. Mark where the wheel reaches the pavement before drawing the rack's footprint. The path into position can be longer than the space ultimately occupied. End with one practical observation based on the route as used and one point to check again. Include enough scale in the sketch for the reader to judge whether the feature affects a whole block or a narrow section. Take a comparison photograph only where you can stand without obstructing other people.

Make a diagram from above and label one position that appears usable only when the neighbouring space is empty. Compare the feature at a time of normal use and a quiet interval where possible. The physical layout will be similar while space available for stopping or turning may change. If one visit was unusual, state what you saw and limit the conclusion to the conditions you can describe.