accident agatka child children fun intrude isolated lollipop play polish post roadsign roadsigns sign signs warning black care caution communicating communication crossing informing pedestrians reflective speed reduction street sign traffic traffic flow yellow candy lolly Lollypop appropriate-behavior appropriate-behaviour careful directive font footpath information message roads roadside signage slow-down slower speed-reduction street street-sign temporary traffic-flow uneven-surfaces walkers walking wording words