An extra rider
If you drive for a living, there is a positive correlation between the number of people you transport and your earnings. This man was eager to make a little more money. The person he is meant to pick up from the airport is named Alice, and that is who is listed on his sign. He has written “random citizen” underneath that name, extending an invitation to another person to accompany them. He needs to earn a livelihood, after all!
An extra rider