vibration

[gsi dave]

driving to work this morning and developed a vibration the faster i went the more severe it was to the point of not being able to hold the wheel its not the first time it has happened also twice before xmas about a week apart have had it on ramp at work and checked bearings ball joints bottom arm bushes any thing u can think of really. however droveit a bit later and it was mint as normal any ideas would be appreciated

[Gaz]

engine mounts
wheel bearings
bent/offbalance wheels

are the normal causes of vibration

[Envoy CDX]

and sometimes tracking