Modifiers matching convoy:

• vehicular,
• ceremonial,

Simple categories matching vehicular:

• equipment,
• transport,
• enclosure,
• system,
• traffic,
• fuel,
• activity,
• unit,
• route,
• service,
• accident,
• surface,
• characteristic,
• structure,
• language,
• application,
• weaponry,
• subject,
• information,
• motion,
• area,
• part,
• event,
• crime,
• convoy,