| Applicability of existing gravel-road deterioration models questioned G Van Zyl, M Henderson, R Uys Transportation research record 1989 (1), 217-225, 2007 | 36 | 2007 |
| Application of the Dynamic Cone Penetrometer (DCP) to light pavement design EG Kleyn, GD Van Zyl International Symposium on penetration testing; ISOPT-1. 1, 435-444, 1988 | 19 | 1988 |
| Variability and control of gravel road visual assessments A Van Der Gryp, G Van Zyl Transportation research record 1989 (1), 247-253, 2007 | 16 | 2007 |
| A review of the dcp-dn pavement design method for low volume sealed roads: development and applications P Paige-Green, GD Van Zyl Journal of Transportation Technologies 9 (4), 397-422, 2019 | 12 | 2019 |
| Management of unpaved roads: developing a strategy and refining models M Henderson, G Van Zyl Southern African Transport Conference, 2017 | 11 | 2017 |
| Optimizing low-volume road network performance through improved management, design, and construction GD Van Zyl, MG Henderson, HG Fourie Transportation research record 1819 (1), 299-305, 2003 | 11 | 2003 |
| Overview of long term seal performance G van Zyl, K Jenkins Conference on Asphalt Pavements for Southern Africa (CAPSA), 1-13, 2015 | 9 | 2015 |
| Key aspects of good performing Cape seals GD Van Zyl, HG Fourie Proceedings of the 11th Conference on Asphalt Pavements for Southern Africa …, 2015 | 9 | 2015 |
| Design Catalog for Low-Volume Roads Developed for South African Conditions H Wolff, SJ Emery, GD Van Zyl, P Paige-Green Washington: Transportation Research Board.(Proc 6th Int Conf on Low Volume …, 1995 | 9 | 1995 |
| Blading optimization: reverting from theory to practice G Van Zyl Transportation research record 2204 (1), 11-20, 2011 | 7 | 2011 |
| High performance gravel roads: gravel road specifications in South Africa and their impact GD Van Zyl, MG Henderson, HG Fourie Publication of: ARRB Transport Research, Limited, 2003 | 7 | 2003 |
| Guidelines for Structural Design of Low-Volume Rural Roads in Southern Africa GD Van Zyl, AT Visser, JA Du Plessis Proc 6th Int Conf on Low Volume Roads, Minneapolis, Minnesota 2, 108-117, 1995 | 7 | 1995 |
| Recommended practice for winter sealing in South Africa GD Van Zyl, HG Fourie, SJ Bredenhann Proceedings of the 11th Conference on Asphalt Pavements for Southern AFRICA …, 2015 | 6 | 2015 |
| A gravel management system for management of operations for the construction and maintenance of gravel roads MG Henderson, GD Van Zyl 6th International Conference on Managing Pavements: The Lessons, The …, 2004 | 5 | 2004 |
| Measurement and interpretation of input parameters used in the South African surface seal design method GD Van Zyl Conference on Asphalt Pavements for Southern Africa, 9th, Gaborone, Botswana, 2007 | 4* | 2007 |
| Managerial considerations in a comprehensive approach to pavement rehabilitation designs GJ Jordaan, GD van Zyl, JH Maree Proceedings of the 1990 Annual Transportation Convention (ATC'90), Pretoria, 1990 | 4 | 1990 |
| Work Effects of Alternative Maintenance Measures on Unsurfaced Roads in the Western Cape GD van Zyl, MG Henderson, JR Uys Seventh International Conference on Managing Pavement AssetsTransportation …, 2008 | 3 | 2008 |
| Strategic planning for optimization of road-building materials in overberg district municipality in South Africa G Van Zyl, G Fourie, M Henderson Transportation research record 1989 (1), 250-259, 2007 | 3 | 2007 |
| Gravel road specifications in South Africa and their impact on performance GD VAN ZYL, MG HENDERSON, HG FOURIE Proc 2nd African T2 Conference, 2005 | 3 | 2005 |
| Simplification of HDM-4 economic models for network-level gravel road management systems AF Burger, A Van der Gryp, GD Van Zyl, HG Fourie Transportation research record 1819 (1), 318-328, 2003 | 3 | 2003 |
