The Essex Act 1987 is a local Act of Parliament (citation 1987 c. xx) that has been put into effect in the former shire county of Essex as it was at the time the legislation was passed in 1987 (i.e. Thurrock and Southend are within the remit of the Act - what is now the entire ceremonial county).
The most notable clause in the law is section 6, allowing the prohibition of parking on grass verges.
References
Essex Act 1987 Wikipedia(Text) CC BY-SA