Question Topic: Hazard awareness
 
                                    
                            A steady, amber light
							                                
                                        
                                    
							                        
                    
                            Several flashing red lights
							                                
                                        
                                    
							                        
                    
                            One barrier has been lowered
							                                
                                        
                                    
							                        
                    
                            Barriers half raised
							                                
                                        
                                    
							                        
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