Bus Traffic Fever! Level 90 Emergency Vehicle Exit Guide

To beat Level 90 in Bus Traffic Fever!, prioritize clearing an exit corridor for the ambulance before moving the fire brigade. Dispatch blocking buses directly to waiting passengers whenever possible, reserve temporary holding bays for true emergencies, and keep the fire brigade stationary until its entire path to the street exit is unobstructed.

Step 1: Free and Route the Ambulance

The ambulance sits closer to an exit branch than the fire brigade. Removing it early eliminates an inner-lane bottleneck and opens a lane for standard buses heading to the passenger platform.

Follow this sequence to clear the ambulance:

Locate the buses perpendicular to the ambulance's forward lane that block its line of travel.
Check the passenger queue at the top of the screen to identify which blocking buses match current passenger colors.
Dispatch only the buses that have waiting passengers, sending them directly to passenger pickup rather than holding bays.
Drive the ambulance off the map once its forward lane is completely empty.

Do not move non-matching buses into holding bays to force the ambulance out unless you have at least two empty bays remaining. Filling those slots early deprives you of maneuvering space for the fire brigade later.

Step 2: Manage Holding Bays and Queue Sequencing

Level 90 fails if the holding bays fill up with buses that do not match the active passenger queue. Treat holding bays as temporary spillover, not permanent parking.

Match passengers directly from the lot: Scan the board for buses matching the first group in line and dispatch them straight to the loading zone.
Clear three-passenger groups immediately: When three passengers of one color reach the front of the queue, move their matching bus immediately to clear interior tiles.
Never park consecutive buses of the same color in holding bays: Stashing duplicate colors wastes limited slots that are needed to shuffle blocking vehicles.
Leave buffer slots open: Keep at least two holding bays empty at all times to handle misaligned vehicles during turning maneuvers.

Step 3: Clear the Fire Brigade Exit Corridor

The fire brigade is positioned centrally and splits the parking lot into two separate zones. Because of its long wheelbase, it cannot turn through tight gaps or idle partially inside an intersection. It requires two contiguous open tiles in front of and behind every turn along its route.

Phase	Objective	Main Risk	Required Action
Phase 1	Clear rear clearance pins	Trapping tail-end colored buses	Clear outer perimeter buses first
Phase 2	Align intersection turns	Blocking the primary loading bay	Ensure turning arcs have two open tiles
Phase 3	Execute fire engine exit	Blocking passenger pickup flow	Dispatch only when the exit path is fully clear

Do not initiate the fire brigade's exit move until the entire path from its parking space to the map border is clear of protruding vehicle bumpers.

Common Mistakes That Cause Gridlock

Most failed runs on Level 90 stem from two early tactical errors:

Shifting the fire brigade prematurely: Moving the fire engine forward by even a single tile before its full route is open cuts the lot in half. This strands buses on the left side of the board and prevents them from reaching the pickup curb on the right.
Filling holding bays out of order: Shuffling colored buses into perimeter slots without checking the passenger line quickly clogs every bay. If the queue demands a color trapped deep in the lot and all holding bays are full, the board enters permanent gridlock. Always clear buses according to current passenger demand to keep your buffer bays open.