active adults alongside backpacks bicycles bikes crash-helmets cycle cycling cyclists energetic energy environmentally-friendly exercise fit fitness helmet helmets movement moving on-the-move outdoors outing path pathway pedal-power pedalling pedals pushbikes recreation safety safety-helmets shade shadows sport sporty sunlight sunshine track transport transportation travel travelling trees wheels youth boy colored colorful colors coloured colourful colours commuters commuting father grab-handles grip gripping handholds handle hanging-strap held holding-on man passengers people railway secure security son standing standing-passengers strap-hung-handles straps suspended-strap toddler train transit travelers traveling travellers views wait waiting window window-views adult child confidence crash-helmet cyclist learning supervised trainer-wheels youngster access-denied access-limited advice alert appropriate-behavior appropriate-behaviour ban banned be-careful beware bicycles-prohibited bylaws communicating communication concern cycling-prohibited danger dangerous denied directions information informing law legal no-bikes no-cycling no-wheels not-allowed not-permitted pedestrian-care pedestrian-safety permission-denied prohibited prohibition prohibitions restricted restriction restrictions risk risks rules sign signs symbol warning warning-sign watch watch-out