Speed Limit Best Practices - TelenavMapping/Telenav_mapping_team_practices_and_workflow GitHub Wiki
Speed limits are often shown on a sign at the start of the restricted section. A posted speed limit may only apply to that road or to all roads beyond the sign. Some places provide an additional "speed zone ahead" ahead of the restriction. Also, speed limit reminder signs may appear at regular intervals, painted on the road surface.
maxspeed=
minspeed=
For two-way streets, where we have different lane values for each way we use:
maxspeed:forward=
maxspeed:backward=
Forward means the direction in which the way is drawn in OpenStreetMap, while backward means the opposite direction.
Be careful when you add speed limit at the measurement system applied in the country you edit. For example if the speed limit it's measured in miles/hour you should add "mph" at the end (ex:maxspeed=50 mph). If you don't add this info it means the default measurement system is in kilometer/hour(kph).
