31 year old victim taken to hospital after attack on Thursday night.
Know A Drink Driver? Dob 'Em In, Save A Life
Police in Hertfordshire are this month encouraging the public to report drink or drug drivers via a confidential phone line.
It's all part of month's THINK! campaign people are being urged to make use of the dedicated line to help make the county's roads safer.
Latest figures (2013), show t 260 people in the UK were involved in fatal collisions involving someone over the drink drive limit.
Driving under the influence of alcohol or drugs dramatically increases a motorist's chances of being involved in a collision that results in someone's death or injury.
Earlier this year the law also changed to make it easier for the police to catch and convict drug drivers. It is now an offence to drive with certain drugs above a specified level in your blood, just as it is with drink driving. Some 17 legal and illegal drugs are covered by the law, including cannabis, cocaine, ecstasy and ketamine.
The limits for all illegal drugs are extremely low, even taking a very small amount of an illegal drug could put someone over the limit.
Officers from the Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit will be conducting an increased number of checks throughout June in an effort to stop drink and drug drivers.
The public can anonymously report a drink or drug driver by calling 01707 354 111.
Both robberies happened within 20 minutes of each other on Wednesday night.
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