Possible Clues:

• Short cut through lab maze?
• Busy rush-hour side road
• Side street much used by cars in rush hours
• Driver finally taking a wrong turn from busy road?
• Short cut to avoid rush-hour traffic
• Greek character, sailor, about to cross river — the quickest route?
• Side road used to escape heavy traffic
• Traffic shortcut
• Operate under promoted sailor - it's a quicker way to work
• Side-street short-cut