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The ice cream truck goes only once through each street and all missed ice cream orders are therefore lost (Rulebook, p.1).

When you write a number and draw the line from the truck to that house, if the truck ends its trip in front of a house with an ice cream cone you circle that cone and then cross off all other ice cream cones on the truck's trip (Rulebook, p.1).

As soon as you circle or cross off the last ice cream cone of a street you earn a bonus of 1 point for each ice cream cone circled in that street; other players must cross off that bonus but may keep selling in the street (Rulebook, p.1).

When you start numbering a house of the 3rd street you must choose which ice cream truck (side) you want and cross off the other, so only one of the two bonuses can apply for that street (Rulebook, p.1).

You earn 1 point per scoop for each ice cream cone that is circled; crossed-off cones do not give scoop points (Rulebook, p.1).

Yes — plan requirements that say a house/estate must have cones “sold” refer to ice cream cones that have been circled, and requirements like “without any ice cream cone sold” mean no circled cones in those estates (City Plans, Rulebook, p.1).