sl200 is correct, you can purchase safety equipment with your bike, so a new helmet or nice night lights are about all the upgrade you can get.
[list]
[*]Cycle helmets which conform to European standard EN 1078[/*]
[*]Bells and bulb horns[/*]
[*]Lights, including dynamo packs[/*]
[*]Mirrors and mudguards to ensure riders visibility is not impaired[/*]
[*]Cycle clips and dress guards[/*]
[*]Panniers, luggage carriers and straps to allow luggage to be safely carried[/*]
[*]Locks and chains to ensure cycle can be safely secured[/*]
[*]Pumps, puncture repair kits, cycle tool kits and tyre sealant to allow for minor repairs[/*]
[*]Reflective clothing along with white front reflectors and spoke reflectors[/*]
[/list]