Speed Enforcement Policies and Practice

Witheford, David K. · 1970 · ROSA P / Eno Foundation for Transportation

archive: archived pipeline: cataloged verified

Get this paper ↗ (full text — opens at the source; we link to it, we don't host it)

Summary

This 1970 report by David K. Witheford, published by the Eno Foundation for Transportation, addresses the lack of uniformity in speed enforcement laws and practices across the United States. Motivated by a significant increase in highway travel, vehicle registrations, and fatalities between 1947 and 1968, the study aims to ascertain current enforcement methods and encourage greater regulatory consistency. The author argues that diverse regulations confuse drivers and hinder the primary goal of speed enforcement: encouraging voluntary compliance to improve highway safety. The research methodology involved a nationwide survey of police departments using two questionnaires. The first questionnaire, distributed to state highway patrols, cities with populations over 25,000, and county agencies, gathered factual data on regulations and procedures. It achieved a 44% response rate, with higher returns from larger jurisdictions. A second questionnaire, sent to a selected sample of 100 police officials, assessed attitudes toward enforcement and judicial policies, yielding a 65% response rate. The study design excluded judicial penalty structures due to their variability and focused instead on statutes, measurement techniques, and apprehension procedures. The findings reveal substantial disparities in speed limit regulations. While 60% of states had adopted "absolute" speed limits by 1968 (up from 40% in 1947), significant regional differences persisted, with Western cities more likely to use "prima facie" limits. Conflicts frequently existed between state and local laws, creating confusion for motorists. Enforcement practices varied widely in technique, with pacing, time-distance measurements, and radar usage differing by region and agency size. The report also highlights inconsistencies in tolerance practices, warning versus citation usage, and the emphasis placed on speed enforcement relative to other traffic violations. The significance of the study lies in its call for better communication between enforcement officials, traffic engineers, and the public. Witheford concludes that the current lack of uniformity undermines the effectiveness of speed control. He suggests that improved understanding of enforcement needs could lead to more suitable speed zoning by engineers and more consistent regulations. The report serves as a baseline for comparing enforcement trends over time and advocates for standardized approaches to enhance highway safety and driver compliance.

Key finding

Significant diversity exists in speed enforcement laws and practices across jurisdictions, with a notable shift from prima facie to absolute speed limits and inconsistencies between state and local regulations contributing to driver confusion.

Methodology

survey

Sample size: 506

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).

Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• speed management
• speed choice

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Applied Guidance: policy recommendations
• Empirical Findings: observational prevalence