A bonnet arrangement for a vehicle, said bonnet arrangement comprising - a bonnet, forming a first mechanical structure, - a pyrotechnical device, - an airbag arrangement comprising an airbag and said pyrotechnical device, and - a hinge arrangement providing a hinged connection between said bonnet and a body structure of said vehicle, said hinge arrangement forming a second mechanical structure, said pyrotechnical device being adapted to, directly or indirectly, influence said first mechanical structure at a first location, such that said first mechanical structure is exposed to a deformation and/or a displacement, said deformation and/or displacement of said first mechanical structure at said first location is adapted to at a second location, being different from said first location, change a functional mode of said second mechanical structure (16, 70) connected to said first mechanical structure by means of direct mechanical influence, said airbag arrangement being adapted to displace said bonnet from a closed position to a deployed position by inflating said airbag upon activation of said pyrotechnical device, said bonnet thereby being exposed to a deformation and/or a displacement at said first location corresponding to said airbag, said hinge arrangement in a first functional mode being displaceable between a first position corresponding to said closed position of said bonnet and a second position corresponding to an open position of said bonnet, and in a second functional mode being displaceable between said first position corresponding to said closed position of said bonnet and a third position corresponding to said deployed position of said bonnet, said bonnet being connected to said hinge arrangement, such that said deformation and/or displacement of said bonnet causes said hinge arrangement to change from said first functional mode to said second functional mode, said hinge arrangement comprises - a first hinge member adapted to be attached, directly or indirectly, to said body structure of said vehicle, - a second hinge member having a first end and a second end, and - a third hinge member adapted to be attached, directly or indirectly, to said bonnet, said first end of said second hinge member being pivotally connected to said first hinge member at a first pivot axis providing said first functional mode, said second end of said second hinge member being pivotally connected to said third hinge member at a second pivot axis providing said second functional mode, said third hinge member further being connected to said second hinge member by means of a retaining member, said retaining member preventing relative motion between said second hinge member and said third hinge member in a longitudinal and/or a vertical direction, said retaining member being adapted to be deactivated at a predetermined force, which predetermined force is equal to or less than a force (F 2, F 3) being exerted on said retaining member by said third hinge member when said bonnet is deformed and/or displaced as a result of said airbag arrangement being activated by said pyrotechnical device, and which predetermined force is larger than a force being exerted on said retaining member by said third hinge member during normal operation of said vehicle and during normal opening of said bonnet in said first functional mode, said deactivation of said retaining member allowing said third hinge member to pivot in relation to said second hinge member, such that said bonnet may assume said deployed position in said second functional mode, characterized in that said retaining member is adapted to be deactivated in a transverse direction of said vehicle, said predetermined force having at least a transverse component. - a bonnet, forming a first mechanical structure, - a pyrotechnical device, - an airbag arrangement comprising an airbag and said pyrotechnical device, and - a hinge arrangement providing a hinged connection between said bonnet and a body structure of said vehicle, said hinge arrangement forming a second mechanical structure, - a first hinge member adapted to be attached, directly or indirectly, to said body structure of said vehicle, - a second hinge member having a first end and a second end, and - a third hinge member adapted to be attached, directly or indirectly, to said bonnet,