The tractor then carried on across the yard until another worker pulled an emergency brake on the vehicle.

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Their feelings spiral out of control at the slightest push, like a car parked on a steep hill without an emergency brake.

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Pfizer's drug tremelimumab and Bristol-Myers Squibb's ipilimumab are antibodies to a protein called CTLA-4 (cytotoxic T-lymphocyte antigen-4) that acts as an emergency brake to prevent killer T cells from attacking healthy tissue.

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An even stronger emergency brake will apply to social security.

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Adaptive Cruise Control, Emergency Brake Assist, available Blind Spot Monitoring, available Automatic High Beam Assist and an available Surround Camera System are all on the menu.

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